Optical Resolution of 2- and 3-Hydroxyalkyltriphenylphosphonium Salts. Stereoselective Synthesis of Enantiomerically Pure (<i>E</i>)- and (<i>Z</i>)-Homoallylic Alcohols
Optically active 2- and 3-hydroxyalkyltriphenylphosphonium salts were prepared by the optical resolution of their 2,3-di-O-benzoyltartrates. The reaction of these salts with butyllithium afforded the corresponding ylides, which reacted with aldehydes to give optically active (E)-homoallylic alcohols in good yields. 3-Hydroxyalkyltriphenylphosphonium salts were converted into the corresponding diphenylphosphine
1,3-Stereocontrol with phosphine oxides: asymmetric synthesis of all four diastereoisomers of a γ′-benzyloxy β-hydroxy phosphine oxide
作者:Adam Nelson、Stuart Warren
DOI:10.1039/a903370j
日期:——
structure of lithiated phosphine oxides. We have developed complementary methods for the asymmetric synthesis of all four diastereomeric β-hydroxy phosphine oxides 4-benzyloxy-2-diphenylphosphinoyl-1-(2-furyl)octan-1-ol and our approach constitutes a formal synthesis of all eight possiblestereoisomers. A series of similar β-hydroxy phosphine oxides were eliminated to give optically active homoallylic