摘要:
3,3-Dilithio-1,1-dimethoxy-3-tosylpropane (6) reacts with mono and dielectrophiles to give dialkylated products 7 and carbocyclic derivatives 8, respectively. Hydrolysis of the acetal function followed by DBU dehydrosulfinylation of these products affords beta,beta-disubstituted propenal derivatives 11 and 12. Reductive desulfonylation of compounds 8g-j provides beta,beta-disubstituted propanal acetals 14.