o‐quinodimethane was investigated. Sterically congested substituents or electron‐donating substituents on the four‐membered ring promoted the ring‐opening, affording o‐quinodimethane in a relatively stable form. Isolation of the newly prepared o‐quinodimethane allowed its structural elucidation and investigation of its potential reactivities. Dual [4+2] cycloaddition of an aryne and o‐quinodimethane
Stereocontrolled synthesis of syn- and anti-diol epoxide metabolites of triphenylene
作者:Masato Koreeda、Ramesh Gopalaswamy、Jinhai Yang、Roeland J. Tuinman
DOI:10.1016/0040-4039(96)01896-5
日期:1996.11
The synthesis of both syn- and anti-diol epoxide metabolites of triphenylene has been achieved under complete stereochemical control commencing with commercially available 9-phenanthrol in 18% (9 steps) and 37% (8 steps) overall yields, respectively. The exceptionally high stereoselectivity of the dimethyldioxiraneoxidation of trans-dihydrodiol having the quasi-diaxially disposed hydroxyl groups is