Intramolecular Metallo-Ene-Allene Reactions. A New Carbocycles Synthesis
摘要:
Polysubstituted enynes have been lithiated on the propargylic position, and transmetalation to the corresponding zinc reagents promotes an easy cyclization reaction leading to polysubstituted cyclopentylmethylzinc derivatives. This cyclization is stereospecific, and a single diastereoisomer is formed, even when a tertiary and a quaternary center are linked in the process. The reaction is considered to take place via a metallo-ene-allene process.
Intramolecular Metallo-Ene-Allene Reactions. A New Carbocycles Synthesis
摘要:
Polysubstituted enynes have been lithiated on the propargylic position, and transmetalation to the corresponding zinc reagents promotes an easy cyclization reaction leading to polysubstituted cyclopentylmethylzinc derivatives. This cyclization is stereospecific, and a single diastereoisomer is formed, even when a tertiary and a quaternary center are linked in the process. The reaction is considered to take place via a metallo-ene-allene process.
Polysubstituted enynes have been lithiated on the propargylic position, and transmetalation to the corresponding zinc reagents promotes an easy cyclization reaction leading to polysubstituted cyclopentylmethylzinc derivatives. This cyclization is stereospecific, and a single diastereoisomer is formed, even when a tertiary and a quaternary center are linked in the process. The reaction is considered to take place via a metallo-ene-allene process.