Patent ID: 7645891

Claim:
A compound of the formula A-1 or A-2: wherein R 1a′ , R 1b′ are the same or different and mean C 1 -C 10 alkyl, C 6 -C 12 aryl, or C 7 -C 20 aralkyl, each optionally substituted; or taken together a —(CH 2 ) m — group, with m=1, 2, 3, 4 or 5, or a —(CH 2 )—O—(CH 2 )— group; R 2a′ means hydrogen, C 1 -C 10 alkyl, C 6 -C 12 aryl or C 7 -C 20 aralkyl, each optionally substituted; —(CH 2 ) ra —C≡C—(CH 2 ) pa —R 26a ; —(CH 2 ) ra —CH═CH—(CH 2 ) pa —R 26a ; R 2b′ means —(CH 2 ) rb —C≡C—(CH 2 ) pb —R 26b ; —(CH 2 ) rb —CH═CH—(CH 2 ) pb —R 26b ; n means 0 to 5, ra, rb are the same or different and mean 0 to 4, pa, pb are the same or different and mean 0 to 3, R 26a , R 26b are the same or different and mean hydrogen; C 1 -C 10 alkyl, C 6 -C 12 aryl or C 7 -C 20 aralkyl, each optionally substituted; C 1 -C 10 acyl, or, if pa or pb>0, additionally a group OR 27 , provided: that, when R 2a′ is hydrogen, R 2b′ is —(CH 2 ) rb —C≡—(CH 2 ) pb —R 26b , rb is 2, and pb is 0, R 26b is not hydrogen, R 27 means hydrogen or a protective group, R 13 means CH 2 OR 13a , CH 2 -Hal, CHO, CO 2 R 13b or COHal, where Hal means a halogen atom, R 13a means hydrogen, SO 2 -alkyl, SO 2 -aryl, SO 2 -aralkyl or together with R 14a a —(CH 2 ) o — group or a CR 15a R 15b group, R 13b means hydrogen, C 1 -C 20 alkyl, C 6 -C 12 aryl, C 7 -C 20 aralkyl, each optionally substituted, R 15a , R 15b are the same or different and mean hydrogen, C 1 -C 10 alkyl, aryl, C 7 -C 20 aralkyl or together a —(CH 2 ) q — group, o means 2 to 4, q means 3 to 6, R 14′ means hydrogen, OR 14a , Hal, OSO 2 R 14b , R 14a means hydrogen, SO 2 -alkyl, SO 2 -aryl, SO 2 -aralkyl or together with R 13a a —(CH 2 ) o — group or a CR 15a R 15b group, R 14b means hydrogen, C 1 -C 20 alkyl, C 6 -C 12 aryl, C 7 -C 20 aralkyl, each optionally substituted, R 30 means hydrogen, R 31 means hydroxyl, or R 30 , R 31 together mean an oxygen atom or a C 2 -C 10 alkylene-α,ω-dioxy group, which can be straight-chain or branched, or R 30 , R 31 independently mean a C 1 -C 10 alkoxy group.