Oxabicicloheptanos and oxabicicloheptenos, their preparation and use

摘要

A compound having the formula ** ** structure in which the α bond is present or absent; R1 and R2 are each independently H, O-, or OR9, wherein R9 is H, alkyl, alkenyl, alkynyl or aryl, or R1 and R2 are together = O; R3 is OH, O-, OR9, SH, S-, SR9; R4 is ** Formula ** where X is 0, S, NR10, or N + R10R10, wherein each R10 is independently alkyl, C2-C12 substituted alkyl, alkenyl, C4-C12 substituted alkynyl, substituted alkynyl, aryl, aryl wherein the substituent is other than chloro when R1 and R2 are = O, ** ** Formula CH2CN, -CH2CO2R11, -CH2COR11, -NHR11 or -NH + (R11) 2 wherein each R11 is independently alkyl or H; R5 and R6 are each independently H, OH, or R5 and R6 taken together are = O; and R7 and R8 are each independently H, F, Cl, Br, SO2F, CO2CH3, or SR12, where R12 is H, aryl or alkyl, alkenyl or alkynyl unsubstituted or substituted, or a salt, enantiomer or zwitterion of the compound .