Patent ID: 8445701

Claim:
A compound of formula F-1: wherein: each of PG 1 and PG 2 is independently a suitable hydroxyl protecting group, taken with the oxygen atom to which it is bound, selected from the group consisting of an acetate, a carbonate, a sulfonate, a silyl ether, an alkyl ether, an arylalkyl ether, and an alkoxyalkyl ether, or PG 1 and PG 2 are taken together, with the oxygen atoms to which they are bound, to form a diol protecting group; R 1 is R or OR; R 2 is CHO or —CH═CH 2 ; and each R is independently hydrogen, C 1-4 haloaliphatic, benzyl, or C 1-4 aliphatic, provided that, when R 1 is OMe, then PG 1 and PG 2 do not form an acetonide group, or PG 1 and PG 2 are H, R 1 is OH, and R 2 is —CH═CH 2 .