| abstract |
The compounds below and their stereoisomers are new. a) 2-(2,2-dimethyl-1,3-dioxan-4-yl)-2-methyl-pentan-3-one (3); b) 6-(tert.-butyldimethylsilyl)oxy-2-methyl-hexanal (4); c) (S,4E)-3-benzyloxy-1-(tert.-butyldimethylsilyl)oxy-4-methyl-5-(2-ethyl thiazol-4-yl)-pent-4-ene (8); d) (4S,6S)-10-(tert.-butyldimethylsilyloxy)-2-(2,2-dimethyl-1,3-dioxan-4- yl)-5-hydroxy-2,4,6-trimethyl-decan-3-one (80); and e) (3S,6R,7S,8S)-7-benzyloxy-3-(tert.-butyldimethylsilyloxy)-12-(tert.but yldiphenylsilyloxy)-4,4,6,8-tetramethyl-5-oxo-dodecanoic acid (87). |