Exploiting the vicinal disubstituent effect on the diastereoselective synthesis of γ and δ lactones
作者:Elisabetta Brenna、Francesco Dalla Santa、Francesco G. Gatti、Giuseppe Gatti、Davide Tessaro
DOI:10.1039/c8ob02715c
日期:——
diastereoisomer ring closes substantially more rapidly than the syn isomer ring; (ii) the anti-vic effect is much stronger than the classical Thorpe–Ingold effect (known also as the gem-disubstituent effect), instead the syn diastereoisomers have rate constants comparable to that of the gem-disubstituted ester; (iii) the vic-effect can be enhanced by increasing the steric hindrance of one of the two substituents
A concise asymmetric synthesis of (−)-<i>trans</i>-aerangis lactone
作者:Rachana Pandey、Ranjana Prakash
DOI:10.1139/cjc-2018-0203
日期:2018.12
A concise stereoselective approach to functionalized δ-lactone skeleton from monosilylated ethylene glycol as a starting material and its application to the asymmetric total synthesis of (−)-trans-aerangis lactone have been demonstrated. The synthesis utilizes the organocatalyzed MacMillan’s cross aldol reaction as a key step.