Suzuki and Stille Cross-Coupling Reactions from β-Iodovinylphosphonate: Stereoselective Access to Various Substituted Vinylphosphonates
摘要:
Stereoselective synthesis of beta-arylvinyl, dienyl, and enynylphosphonates was achieved from diethyl 2-iodovinylphosphonate via Suzuki or Stille cross-coupling reactions in good yields.
Stereoselective Synthesis of Dienyl Phosphonates via Extended Tethered Ring-Closing Metathesis
摘要:
Allylphosphonates of allylic alcohols were converted to conjugated dienyl phosphonates in a one-flask reaction, comprising a ring-closing metathesis (RCM), a base-induced ring-opening, and an alkylation. The ring-opening proceeds with very high diastereoselectivity, giving exclusively the (1Z,3E)-configured dienes. Single diastereomers and mixtures of diastereomers can be used as starting materials without noticeable effect on the diastereoselectivity of the sequence.