Patent ID: 7462746

Claim:
A compound of formula 4: wherein: n is an integer from 0-4; Ra is hydrogen, alkyl, alkenyl, alkynyl, allenyl, aryl, heteroaryl, acyl, carboxyalkyl, or carboxyaryl; R 1 is hydrogen, alkyl, alkenyl, alkynyl, allenyl, aryl or heteroaryl; R 2 and R 3 are independently selected from the group consisting of hydrogen, alkyl, aryl, hydroxy, alkoxy, acyl, carboxyalkyl, carboxamido, alkylamino, dialkylamino, acylamino, silyl, phosphinyl, sulfonyl, sulfinyl, and alkylsulfonate, provided that R 2 and R 3 can be joined together to form one or more rings; the Z substituents are independently selected from the group consisting of hydroxy, hydrogen, and —OR, where R is aryl, silyl, acyl, alkoxyacyl, aminoacyl, or unsubstituted alkyl, provided that Z can exist as an acetal or ketal and provided that at least one Z substituent is hydroxy or —OR, wherein either R 4 is alkenyl; alkynyl; allenyl; substituted phenyl; phenyl fused to an aryl or cycloalky ring; or napthyl; or R 4 is alkenyl, alkynyl, allenyl, or aryl, and one or more of R 2 or R 3 is allyl or substituted allyl.