Stereocontrolled one-pot synthesis of cyclopentane derivatives possessing quaternary carbon using allyl phenylsulfone and epoxyiodide was presented. Furthermore, application of this protocol to the synthesis of cycloalkane derivatives with different ring sizes was successful.
A new thiourea catalyst is reported for the enantioselective cationic polycyclization of hydroxylactams. Both the yield and enantioselectivity of this transformation were found to vary strongly with the identity of a single aromatic residue on a common catalyst framework, with more expansive and polarizable arenes proving optimal. Evidence is presented for a mechanism in which stabilizing cation-Pi interactions are a principal determinant of enantioselectivity.
Biomimetic heterocyclisation of aryl olefins one-step formation of two carbon-carbon bonds
作者:J. Dijkink、W.N. Speckamp
DOI:10.1016/s0040-4020(01)93600-2
日期:1978.1
Synthesis of 3-Oxaterpenoids and Its Application in the Total Synthesis of (±)-Moluccanic Acid Methyl Ester
InBr3‐catalyzed intermolecular polyene cyclization initiated by a Prins reaction provides a concise approach to 3‐oxaterpenoid derivatives. The reaction is compatible with various aldehydes, ketones, and polyolefin–alcohol substrates. In addition, the totalsynthesis of (±)‐moluccanic acid methyl ester was achieved in seven steps by using such a Prins–polyene cyclization as the key step.