NOVEL METHODS OF SYNTHESES OF PHTHALOCYANINE COMPOUNDS

Abstract: The present invention provides improved methods for synthesizing phthalocyanines, particularly HOSiPcOSi(CH3)2(CH2)3N(CH3)2, which do not involve photolysis, and which produces purity of at least about 95 %, and in the preferred embodiment of the first method of synthesis provide a yield of greater than about 70 % and typically greater than 80 %. The first method involves a method for synthesizing a phthalocyanine compound comprising the following steps: providing a phthalocyanine precursor having a central silicon; adding a first aminosiloxy ligand to the central silicon of the phthalocyanine precursor adding a second aminosiloxy ligand to the central silicon of the phthalocyanine precursor; displacing the second aminosiloxy ligand by an organic acid ligand, preferably C13CCOO ligand; then displacing the C13CCOO ligand with an HO ligand. The second method for making Pc4 is a method for synthesizing a phthalocyanine compound comprising the following steps: providing a phthalocyanine precursor having a central silicon; providing a siloxy ligand with an iodo group; adding a first and second siloxyiodo ligand to the central silicon of the phthalocyanine precursor; displacing the second siloxyiodo ligand by an organic acid, preferably a C13CCOO ligand; then displacing the C13CCOO ligand with an HO ligand; and then displacing the iodo group with a dimethylamino group. The invention also relates to methods for making two novel phthalocyanine compounds HOSiPcOSi(CH3)2(CH2)3I and SiPc[OSi(CH3)2(CH2)3I]2, and to the compounds themselves which are useful as dyes and in photodynamic therapy.

Description: Novel Methods of Syntheses of Phthalocyanine Compounds Background of the Invention Conventional methods for synthesizing phthalocyanine pharmaceutical compounds, particularly HOSiPcOSi (CH 3 ) 2 (CH 2 ) 3 N (CH 3 ) 2 # employs a blocking methyl group to prevent the addition of more than one aminosiloxy group on the central silicon of the phthalocyanine precursor. Once the aminosiloxy ligand has been added, this blocking group is displaced with the desired HO group through a photolysis step. However, this method of synthesis has various disadvantages; photolysis requires unusual apparatus, is quite time consuming, and results in relatively low yield, typically about 50 to 60% of the product. It would be desirable to have a method for synthesizing phthalocyanines, particularly HOSiPcOSi (CH 3 ) 2 (CH 2 ) 3 N(CH 3 ) 2 that does not involve photolysis step, and provides an improved yield. Summary of the Invention The present invention provides improved methods for synthesizing phthalocyanines, particularly HOSiPcOSi (CH 3 ) 2 (CH 2 ) 3 N(CH 3 ) 2 , which do not involve photolysis, and which produces purity of at least about 95%, and in the preferred embodiment of the first method of synthesizing Pc 4, provide a yield of greater than about 70% and typically greater than 80%. The first method involves a method for synthesizing a phthalocyanine compound comprising the following steps: providing a phthalocyanine precursor having a central silicon; adding a first aminosiloxy ligand to the central silicon of the phthalocyanine precursor; adding a second aminosiloxy ligand to the central silicon of the phthalocyanine precursor; displacing the second aminosiloxy ligand by an organic acid ligand, preferably Cl 3 CCOO ligand; then displacing the Cl 3 CCOO ligand with an HO ligand. The second method for making Pc4 is a method for synthesizing a phthalocyanine compound comprising the following steps: providing a phthalocyanine precursor having a central silicon; providing a siloxy ligand with an iodo group; adding a first and second siloxyiodo ligand to the central silicon of the phthalocyanine precursor; displacing the second siloxyiodo ligand by an organic acid, preferably a Cl 3 CCOO ligand; then displacing the a C1 3 CC00 ligand with an HO ligand; and then displacing the iodo group with a dimethylamino group. The invention also relates to methods for making two novel phthalocyanine compounds HOSiPcOSi (CH 3 ) 2 (CH 2 ) 3 I and SiPc [OSi (CH 3 ) 2 (CH 2 ) 3 I] 2 an< i o the compounds themselves which are useful as dyes and in photodynamic therapy. Description of the Invention The methods of the present invention are useful in making phthalocyanine compounds having the following general structure : wherein: M is (G) a Y[ (OSi (CH 3 ) 2 (CH 2 ) b N c (R') d (R") e ) £ X g ] p Y is Si; R' is selected from the group of H, C, CH 2 , CH 3 , C 2 H 5 , C 4 H 9 , C 4 H 8 NH, C 4 H 8 N, C 4 H 8 NCH 3 , , C 4 H 8 S, C 4 H 8 0, C 4 H 8 Se, CH 2 CH 3 , (CH 2 ) 3 (CH 3 ) 2 , OC(0)CH 3 , OC(O) , (CH 3 ) 2 (CH 2 ) 11 , CS, CO, CSe, OH, C 4 H 8 N ( CH 2 ) 3 CH 3 , (CH 2 ) 3 N (CH 3 ) 2 , C(O)C 27 H 30 N 2 O, (CH 2 ) n N( (CH) 0 (CH 3 ) ) 2 , an alkyl group having from 1 to 12 carbon atoms; R " is selected from the group of H, Sθ 2 CH 3 , (CH 2 ) 2 N(CH 3 ) 2 , (CH 2 ) 11 CH 3 , (CH 2 ) n N( (CH) C (CH 3 ) ) 2 , and an alkyl group having from 1 to 12 carbon atoms; G is OH; X is selected from the group of: I; F; Cl; or Br; a = 0 or 1; b = an integer from 2 to 12 ; c = 0, 1; d = 0, 1, 2, or 3; e = 0, 1, or 2; f = 1; g = 0 or 1; n = an integer from 1 to 12 ; o = an integer from 1 to 11; p = 1 where a is l,or 2 where a is 0. Preferably, M is HOSiOSi (CH 3 ) 2 (CH 2 ) 3 N(CH 3 ) 2/ HOSiOSi(CH 3 ) 2 (CH 2 ) 3 I or Si [OSi (CH 3 ) 2 (CH 2 ) 3 I] 2 . In the method for making Pc 4 of the prior art, the steps that are believed to occur are: (1) (CH 3 0) 3 Si (CH 2 ) 3 N(CH 3 ) 2 + CH 3 MgCl → CH 3 OSi (CH 3 ) 2 (CH 2 ) 3 N (CH 3 ) 2 (2) CH 3 OSi(CH 3 ) 2 (CH 2 ) 3 N(CH 3 ) 2 + CH 3 SiPcθH →CH 3 SiPcθSi (CH 3 ) 2 (CH 2 ) 3 N (CH 3 ) 2 (3) CH 3 SiPcOSi ( CH 3 ) 2 (CH 2 ) 3 N(CH 3 ) 2 + 0 2 + [H] ' g * > HOSiPcOSi (CH 3 ) 2 (CH 2 ) 3 N (CH 3 ) 2 or ( 4 ) CH 3 SiPcOSi (CH 3 ) 2 (CH 2 ) 3 N ( CH 3 ) 2 + 0 2 ' g > HOSiPcOSi (CH 3 ) 2 (CH 2 ) 3 N (CH 3 ) 2 where "H" represents a source of hydrogen . The byproducts in reactions (3) and (4) are different. The prior art synthesis uses a blocking methyl group to prevent the addition of more than one aminosiloxy group on the central silicon of the phthalocyanine precursor. Then, after the aminosiloxy ligand has been added, this blocking group is displaced with the desired HO group through a photolysis step. The First Method of Synthesizing Pc 4 In contrast to the prior art, the first new method of synthesis, avoids a photolysis step; an extra aminosiloxy ligand is added on the central silicon of the phthalocyanine precursor and then the sequential displacement of this extra ligand by an organic acid, preferably Cl 3 CCOO ligand and the desired HO ligand. The organic acid is a non-mineral acid, which has an acidity of Cl 3 CCOOH, is soluble in organic solvent used in the reaction, and includes but is not limited to Cl 3 CCOOH and C1 2 CHC00H. The first method involves a method for synthesizing a phthalocyanine compound comprising the following steps : providing a phthalocyanine precursor having a central silicon; adding a first aminosiloxy ligand to the central silicon of the phthalocyanine precursor; adding a second aminosiloxy ligand to the central silicon of the phthalocyanine precursor; displacing the second aminosiloxy ligand by an organic acid ligand, preferably Cl 3 CCOO ligand; then displacing the C1 3 CC00 ligand with an HO ligand. The steps in the preferred embodiment of the first synthesis, that are believed to occur are summarized as: (5) (CH 3 θ) 3 Si (CH 2 ) 3 N(CH 3 ) 2 + CH 3 MgCl → CH 3 OSi (CH 3 ) 2 (CH 2 ) 3 N (CH 3 ) 2 (6) CH 3 OSi(CH 3 ) 2 (CH 2 ) 3 N(CH 3 ) 2 + SiPc (OH) 2 → SiPc[OSi(CH 3 ) 2 (CH 2 ) 3 N(CH 3 ) 2 ] 2 (7) SiPc[OSi(CH 3 ) 2 ( CH 2 ) 3 N ( CH 3 ) 2 ] 2 + Cl 3 CCOOH → Cl 3 COOSiPcOSi (CH 3 ) 2 (CH 2 ) 3 N (CH 3 ) 2 (8) Cl 3 COOSiPcOSi ( CH 3 ) 2 ( CH 2 ) 3 N(CH 3 ) 2 + H 2 0 → HOSiPcOSi (CH 3 ) 2 (CH 2 ) 3 N (CH 3 ) 2 That is, the photolysis step is avoided; this results in a phthalocyanine product having an improved purity. The phthalocyanines produced according to the first improved method have a purity of about 98%; in contrast to the methods of the prior art where the purity is about 95%. Further, the improved method provides a higher yield, that is, about 70% to 80%, rather than about 50% to 60%. The Method Second Synthesis of Pc 4 The second synthesis of HOSiPcOSi (CH 3 ) 2 (CH 2 ) 3 N(CH 3 ) 2 uses a different approach from both the prior art and the first method. The second method for making Pc4 is a method for synthesizing a phthalocyanine compound comprising the following steps : providing a phthalocyanine precursor having a central silicon; providing a siloxy ligand with an iodo group; adding a first and second siloxyiodo ligand to the central silicon of the phthalocyanine precursor; displacing the second siloxyiodo ligand by an organic acid, preferably a C1 3 CC00 ligand; then displacing the a C1 3 CC00 ligand with an HO ligand; and then displacing the iodo group with a dimethylamino group. The steps that probably occur in the preferred embodiment of the second method of synthesis of Pc 4 can be summarized as: (9) CH 3 OSi (CH 3 ) 2 (CH 2 ) 3 C1 + Nal → CH 3 OSi (CH 3 ) 2 (CH 2 ) 3 I (10) CH 3 OSi(CH 3 ) 2 (CH 2 ) 3 I + SiPc (OH) 2 → SiPc [OSi (CH 3 ) 2 (CH 2 ) 3 H 2 (11) SiPc[OSi(CH 3 ) 2 (CH 2 ) 3 I] 2 + Cl 3 CCOOH -> Cl 3 CCOOSiPcOSi (CH 3 ) 2 (CH 2 ) 3I (12) Cl 3 CCOOSiPcOSi(CH 3 ) 2 (CH 2 ) 3 I + H 2 0 → HOSiPcOSi (CH 3 ) 2 (CH 2 ) 3I (13) HOSiPcOSi (CH 3 ) 2 (CH 2 ) 3 I + HN(CH 3 ) 2 → HOSiPcOSi (CH 3 ) 2 (CH 2 ) 3 N(CH 3 ) 2 ) In the second method for making Pc 4 , a hydroxysiloxysilicon phthalocyanine in which the siloxy ligand terminates in an iodo group is first formed. Then, in the final reaction the iodo group is displaced with the desired dimethylamino group. Thus, in this approach the aminosiloxy ligand is built up stepwise on the phthalocyanine rather than being formed separately. The Pc4 produced according to the second improved method have a purity of about 98%; in contrast to the methods of the prior art where the purity is about 95%. This second synthesis is particularly useful because it offers a procedure for making Pc 4 labeled with 14 C. The reagent 14 C labeled NH(CH 3 ) 2 is added in the last step of the method, preferably with unlabeled with HN(CH 3 ) 2 . Suitable 14c labeled NH(CH 3 ) 2 i s commercially available from New England Nuclear Corporation, 549 Albany Street, Boston, MA 02118 and Amersham Life Science, Inc., 2636 South Clearbrook Drive, Arlington Heights, IL. The 14 C labeled Pc 4 is useful reagent for pharmacokinetic studies of Pc . Compounds HOSiPcOSi (CH 3 ) 2 (CH 2 ) 3I and SiPc [OSi (CH3 ) 2 (CH 2 ) 3 I] 2 which are made as intermediates in the method for making Pc 4 , are also useful in photodynamic therapy, including therapies disclosed in U.S. Patent No. 5,166,197, issued November 24, 1992, to Kenney et. al.; U.S. Patent No. 5,484,778, issued January 16, 1996, to Kenney et . al . ; and in "New Phthalocyanine Photosensitizers for Photodynamic Therapy", Oleinick, et. al . Photochemistry and Photobiology, (1993) , Volume 57 , pages 242-247, which are specifically incorporated herein by refeence. Compounds HOSiPcOSi (CH 3 ) 2 (CH 2 ) 3 I and SiPc [OSi (CH 3 ) 2 (CH 2 ) 3 I] 2 # are also usefu l as reagents, and for experimental and research. The following examples are intended to be illustrative only and not intended to in any way limit the scope of the invention. Example 1 Preferred Method for Synthesis of HOSiPcOSi (CH 3 ) 2 (CH 2 ) 3 N(CH 3 ) 2 , Pc 4 HOSiPcOSi (CH 3 ) 2 (CH 2 ) 3 N(CH 3 ) 2 , Pc 4, was made by a synthesis in which CH 3 OSi (CH 3 ) 2 (CH 2 ) 3 N(CH 3 ) 2 , SiPc [OSi (CH 3 ) 2 (CH 2 ) 3 N (CH 3 ) 2 ] 2 (Pc 12), Cl 3 CCOOSiPcOSi(CH 3 ) 2 (CH 2 ) 3 N(CH 3 ) 2 , and finally Pc 4 were prepared in sequence. Preparation of CH 3 OSi (CH 3 ) 2 (CH 2 ) 3 N(CH 3 ) 2 CH 3 OSi (CH 3 ) 2 (CH 2 ) 3 N(CH 3 ) 2 was prepared as described in U.S. Patent No. 5,166,197, issued November 24, 1992, to Kenney et al . and in "New Phthalocyanine Photosensitizers for Photodynamic Therapy", Oleinick, et. al . Photochemistry and Photobiology. 1993, volume 57 , pages 242- 247 , at page 243 . Preparation of SiPc [OSi (CH 3 ) 2 (CH 2 ) 3 N(CH 3 ) 2 ] 2 Pc 12. A mixture of 980 mg, 5.59 mmol of CH 3 OSi (CH 3 ) (CH 2 ) 3 N (CH 3 ) 2 and a suspension of 400 mg, 0.697 mmol SiPc (OH) 2 and 400 mL pyridine that had been dried by distillation (about 20 mL of distillate) , was slowly distilled for 3 hours (about 20 mL of distillate) and then filtered. The filtrate was evaporated to dryness with a rotary evaporator at about 40°C, and the solid was washed with an 2:3, 150 mL ethanol-water solution, then dried at about 60 torr, about 70°C and weighed 552 mg. NMR analysis revealed : (300 MHz, CDCI3) : delta 9.61 (m, 1,4-Pc H) , 8.31 (m, 2,3-Pc H) , 1.60 (s, NCH3 ) , 0.82 (m, gamma-CH 2 ) , -1.12 (m, beta-CH 2 ) , -2.30 (m, alpha-CH 2 ), -2.91 (s, SiCH 3 ) . The resulting SiPc [OSi (CH 3 ) 2 (CH 2 ) 3 N(CH 3 ) 2 ] 2 which is blue, is soluble in dimethylformamide and CH 2 C1 and is insoluble in hexanes and water. Preparation of Cl 3 CC Q OSiPcOSi ( CH 3 ) (CH 2 ) 3 N(CH 3 ) 2 A solution of 552 mg of SiPc [OSi (CH 3 ) 2 (CH 2 ) 3 N (CH 3 ) 2 1 2 also referred to herein as "Pc 12", 590 mg, 3.61 mmol trichloroacetic acid, and 90 mL CH 2 C1 2 was stirred at room temperature for 5 hours. The resultant was mixed with 90 mL pyridine and then with 90 mL H 2 0, and the mixture formed was separated. The aqueous layer was washed with 100 mL CH 2 C1 2 , the washings were filtered, and the residue was washed with 200 mL CH 2 Cl 2 The organic layer was filtered, and the filtrate and CH 2 C1 2 washings were combined and evaporated to dryness with a rotary evaporator at about 40°C. The solid was dried at about 60 torr, and at about 60°C to provide 647 mg of the blue-green compound, Cl 3 CCOOSiPcOSi- (CH 3 ) 2 (CH ) 3 N(CH 3 ) 2 _ NMR analysis revealed; (300 MHz, CDC1 3 ) delta 9.68 (m, 1,4-Pc H) , 8.19 (m, 2,3-Pc H) , 1.61 (s, NCH 3 ) , 0.85 (m, gamma-CH 2 ) , -1.03 (m, beta-CH 2 ) , -2.16 (m, alpha- CH 2 ) , -2.78 (s, SiCH 3 ) . Preparation of HOSiPcOSi (CH 3 ) 2 (CH 2 ) 3 N(CH 3 ) 2 , Pc 4 A solution of 647 mg Cl 3 CCOOSiPcOSi (CH 3 ) 2 (CH 2 ) 3 N(CH 3 ) 2 and 20 mL CH 2 C1 2 was passed down a 3 x 24 cm chromatography column composed of Al 2 θ 3 V. The loaded column was then eluted with a solution of 1.5 parts CH2CI2-ethyl acetate, and the eluate was evaporated to dryness with a rotary evaporator at about 40°C. The solid was extracted into 20 mL CH 2 C1 2 , recovered by evaporating the extract with a rotary evaporator, dissolved in 3 ml of CH 2 C1 2 , and precipitated with 12 mL pentane. The precipitate was recovered by filtration, washed with a 1:4, 15 mL of CH 2 Cl2 -pentane solution and 20 mL pentanedried at about 60 torr, 60°C and weighed (416 mg, 0.580 mmol, 83% based on SiPc (OH) 2 used) . UV-vis (dimethylformamide) lambda max (nm) ; epsilon (M ~1 cm " 1 ) : 668; 230,000. NMR analysis revealed (300 MHz, 8.4 mM, CDCI3): delta 9.11 (m, 1,4-Pc H) , 8.18 (m, 2,3-Pc H) , 1.35 (s, NCH3 ) , 0.60 (m, gamma-CH 2 ) , -1.36 (m, beta-CH 2 ) , -2.49 (m, alpha-CH 2 ), -2.66 (s, SiOH) , -3.10 (s, SiCH 3 ) . Example 2 Second Method for Synthesis of Pc 4. Pc 4 was also made by a synthesis in which CH 3 OSi (CH 3 ) 2 (CH 2 ) 3I, SiPc[OSi (CH 3 ) 2 (CH 2 ) 3 I] 2 also referred to herein as "Pc 59", HOSiPcOSi (CH 3 ) 2 (CH 2 ) 3I also referred to herein as "Pc 58", and finally Pc 4 were prepared in sequence. Preparation of CH 3 0Si (CH 3 ) 2 (CH 2 ) 3I A mixture of 10.6 g, 0.0700 mol CH 3 OSi (CH 3 ) 2 (CH 2 ) 3 C1 , 20.8 g, 0.105 mol Nal and 100 mL acetone was refluxed for 2 days and filtered. The solid was washed with 50 mL acetone, and the washings and filtrate were combined and concentrated with a rotary evaporator at about 30°C. The concentrate was mixed with 50 mL ether, and the resulting suspension was filtered. The solid was washed with 100 ml ether, and the washings and the filtrate were combined and concentrated with a rotary evaporator at about 30°C. The concentrate weighed 14.9 g. NMR analysis at 200 MHz, in CDC1 3 re vealed : delta 3.40 (s, CH3O) , 3.17 (m, gamma-CH 2 ), 1.84 (m, beta-CH 2 ), 0.67 (m, alpha-CH 2 ) , 0 . 08 (s , SiCH 3 ) . The CH 3 OSi (CH 3 ) 2 (CH 2 ) 3 I is a yellow, mobile liquid. Preparation of SiPc [OSi (CH 3 ) 2 (CH 2 ) 3 I] 2 A mixture of 1.80 g CH 3 0Si (CH 3 ) 2 (CH 2 ) 3I, 401 mg, 0.698 mmol SiPc (OH) 2 and 300 mL xylene was slowly distilled for 6 hours to produce about 35 mL of distillate, and the mixture was evaporated to dryness with a rotary evaporator at about 50°C. The solid was washed with 75 mL ethanol and a 1:1, 70 mL ethanol-water solution, then dried at about 60 torr, 60°C, and weighed (567 mg, 0.537 mmol, 77 %) . NMR analysis at 300 MHz, in CDCI3 revealed: delta 9.65 (m, 1,4-Pc H) , 8.34 (m, 2,3-Pc H) , 1.75 (m, gamma-CH 2 ), -0.84 (m, beta-CH 2 ), 2.21 (m, alpha-CH 2 ), -2.87 (s, SiCH 3 ). The SiPc [OSi (CH 3 ) 2 (CH 2 ) 3 I] 2 which is blue, is soluble in dimethylformamide and CH 2 C1 2 and is insoluble in hexanes and water. Preparation of HOSiPcOSi (CH3) 2 (CH 2 ) 3I A solution of 514 mg, 0.488 mmol unchromatographed SiPc [OSi (CH 3 ) (CH 2 ) 3 I] 2 1.64 g, 10.0 mmol. trichloroacetic acid and 250 mL CH 2 Cl 2 was stirred at room temperature for 5 hours, then mixed with 100 mL pyridine and then with 100 mL H 2 0. The aqueous layer was washed with 60 mL CH 2 Cl , the washings were filtered, and the residue was washed with 100 mL CH 2 Cl 2 . The organic layer was filtered and the filtrate and CH 2 C1 2 washings were combined and evaporated to dryness with a rotary evaporator (about 40°C) . The solid was chromatographed on an A1 2 0 3 V substrate, with CH 2 C1 2 -ethyl acetate, in a 1:1 ratio, dissolved in 4mL CH 2 Cl2 precipitated with 6 mL pentane, recovered by filtration, washed with 20 mL pentane and a 1:1, 20 mL ethanol-water solution, dried at about 60 torr, about 60°C and weighed (188 mg, 0.235 mmol, 48%). NMR analysis revealed (300 MHz, 7.0 mM, CDC1 3 ): delta 9.22 (m, 1,4-Pc H) , 8.22 (m, 2,3-Pc H) , 1.59 (m, gamma-CH 2 ) , -1.01 (m, beta-CH 2 ) , -2.36 (m, alpha-CH 2 ) , -3.04 (s, SiCH 3 ) , -3.22 (s, SiOH) . The HOSiPcOSi (CH 3 ) 2 (CH 2 ) 3 I , which is blue, is soluble in dimethylformamide and CH 2 Cl2 and is insoluble in hexanes and water. Preparation of HOSiPcOSi (CH3) 2 (CH 2 ) 3 N(CH 3 ) 2 , Pc 4, the Final Stage A stirred suspension of 30.9 mg, 0.0386 mmol HOSiPcOSi (CH 3 ) 2 (CH 2 ) 3 I, 5.2 mg, 0.038 mmol K 2 C0 3 , a solution of HN(CH 3 ) 2 in 2M, 0.5mL, 1 mmol tetrahydrofuran solution and 9.5 mL tetrahydrofuran in a pressure tube (15 L) was warmed at about 60 °C for 48 hours and evaporated to dryness with a rotary evaporator at about 30°C. The solid was extracted into 20 mL CH 2 C1 , recovered by evaporating the extract with a rotary evaporator (room temperature) , dissolved in 1 mL CH C1 2 , precipitated with 4 L pentane, recovered by filtration, washed with a solution of CH 2 C1 2 and 1:4, 15 mL pentane, 10 mL pentane and an 1:4, 10 mL ethanol-water solution, dried at about 60 torr, at about 60°C and weighed (22.1 mg, 0.0308 mmol, 80 %, 30 % based on SiPc (OH) 2 used) . Example 2a The procedure of Example 2 was followed, except in the final stage a smaller ratio of HN(CH 3 ) 2 to HOSiPcOSi (CH 3 ) 2 (CH 2 ) 3 I was employed. Specifically, a stirred suspension of 40.5 mg, 0.0506 mmol HOSiPcOSi (CH 3 ) 2 (CH 2 ) 3 I, Pc 58, 2.4 mg, 0.017 mmol K 2 C0 3 , a solution of HN(CH 3 ) 2 in 2M, 0.2 mL, 0.4 mmol tetrahydrofuran and 4.8 mL tetrahydrofuran (4.8 mL) in a 5 mL heavy-wall reaction vial was warmed at about 60°C for 24 hours, and evaporated to dryness with a rotary evaporator at about 30°C. The solid was extracted into 20 mL CH 2 Cl 2 recovered by evaporating the extract to dryness with a rotary evaporator at room temperature, dissolved in 1 mL CH 2 Cl2 precipitated with 4 mL pentane, recovered by filtration, washed with a 1:4, 15 L CH 2 C1 2 -pentane solution, 10 mL pentane and an 1:4, 10 mL ethanol-water solution, dried at about 60 torr, at about 60°C, chromatσgraphed on a A1 2 0 3 III substrate using ethyl acetate- methanol, in a ratio of 10:1, washed with 15 mL pentane and an 1:4, 10 mL ethanol-water solution, dried at about 60 torr, 60°C and weighed (17.5 mg, 0.0243 mmol, 48%, 18% based on SiPc (OH) 2 used). Example 2b The synthesis of Example 2 is followed, except that a metallic derivative of HN(CH 3 ) 2 , preferably a group I metal derivative, including, for example LiN(CH 3 ) 2 and NaN(CH 3 ) 2 is substituted for HN(CH 3 ) 2 _ since he halosiloxy phthalocyanine and the amine may be used in an approximately 1:1 ratio, and thus is more efficient. Example 2c The procedure of Example 2 is followed except that a mixture of 14 C labeled NH(CH 3 ) 2 and HN(CH 3 ) 2 , is added in the last reaction with to provide Pc 4 labeled with 1 4 C. Although one embodiment of this invention has been shown and described, various adaptations and modifications can be made without departing from the scope of the invention as defined in the appended claims .

Claims: What is claimed is: 1. A method for synthesizing a phthalocyanine compound comprising the following steps : a. providing a phthalocyanine precursor having a central silicon; b. adding two aminosiloxy ligands to the central silicon of the phthalocyanine precursor; c. displacing one of the aminosiloxy ligands by an organic acid 1igand; d. then displacing the organic acid ligand with an HO ligand. 2. The method of claim 1, wherein the phthalocyanine compound is HOSiPcOSi (CH 3 ) 2 (CH 2 ) 3 (CH 3 ) 2 , the phthalocyanine precursor is SiPc (OH) 2 and the amino siloxy ligand is CH 3 OSi(CH 3 ) 2 (CH 2 ) 3 N(CH 3 ) 2- 3. The method of claim 2, wherein the organic acid ligand is C1 3 CC00. 4. The method of claim 1, wherein the synthesis is accomplished without photolysis. 5. A method for synthesizing a phthalocyanine compound comprising the following steps: a. providing a phthalocyanine precursor having a central silicon; b. providing a siloxy ligand with iodo group; c. adding a first and second siloxyiodo ligand to the central silicon of the phthalocyanine precursor. 6. The method of claim 4, wherein the phthalocyanine produced from step c is SiPc [OSi (CH 3 ) 2 (CH 2 ) 3 I] 2 . 7. The method of claim 5, further comprising the steps of: d. displacing one of the two siloxyiodo ligand by an organic acid ligand; e. then displacing the organic acid ligand with an HO ligand. 8. The method of claim 7 , wherein the phthalocyanine produced from step e is HOSiPcOSi (CH 3 ) 2 (CH 2 ) 3 I 9. The method of claim 5, further comprising the steps of: d. displacing one of the two siloxyiodo ligands by an organic acid ligand; e. then displacing the organic acid ligand with an HO ligand; f. then displacing the iodo group with a dimethylamino group. 10. The method of claim 9, wherein the phthalocyanine compound is HOSiPcOSi (CH 3 ) 2 (CH 2 ) 3 N(CH 3 ) 2 and the organic acid ligand is Cl 3 CCOO ligand. 11. The method of claim 9, wherein the dimethylamino group is 14 C labeled. 12. The method of claim 9, wherein the dimethylamine group is provided by a group I metal dimethylamine . 13. A phthalocyanine compound selected from the group consisting of: HOSiPcOSi (CH 3 ) 2 (CH 2 ) 3 I and SiPc [OSi (CH 3 ) 2 (CH 2 ) 3 I] 2 _ 14. A phthalocyanine compound of claim 13 , wherein the phthalocyanine HOSiPcOSi (CH 3 ) 2 (CH 2 ) 3 I . 15. A phthalocyanine compound of claim 13, wherein the phthalocyanine SiPc [OSi (CH 3 ) 2 (CH 2 ) 3 I] .

Inventors: KENNEY MALCOLM E, LI YING-SYI, KENNEY, MALCOLM, E., LI, YING-SYI
Applicants: UNIV CLEVELAND HOSPITALS, UNIVERSITY HOSPITALS OF CLEVELAND
Application year: 1997
Main classification: C09B47
IPC codes: A61K41, C07D487, C09B47