| abstract |
Cyclopentenes [I; R = OH protecting gp. of -CH2R1 ; A = -CH2 or -CS2 were prepd. by the reaction of II and diisobutyl aluminium hydride in a hydrous solvent. Thus, (3R,4S,5R)-3,4-ocyclohexylidene-3,4,5- trihydroxy-cyclohexanone was mixed with ethanedithiol and boron trifluoride etherate to give (3R,4S,5R)3,4,5-trihydroxy- cyclohexanone-ethylenedithioacetal, which was reacted with dimethoxycyclohexane and N,N-dimethylformamide, to give 2- formylpropyleneacetal-4(R)-benzyloxy-2-cyclopentenol. |