Préparation des organozinciques dérivés de l'α-bromométhyl acrylate d'éthyle et de ses homologues
作者:Najat El Alami、Chantal Belaud、Jean Villiéras
DOI:10.1016/0022-328x(88)80333-4
日期:1988.6
α-bromoalkyl acrylates (aliphatic and alicyclic) results in high yields when carried out on 30 mesh activated granular zinc, between 14 and 20°C in ethereal solvents (THF, DME, ether). Under these conditions duplication can be minimized (5–15%) especially with t-butyl acrylates. These α-functional allylic organozinc derivatives have been characterized by hydrolysis and coupling with benzaldehyde.
The asymmetric synthesis of α-methylene-γ-butyrolactones via a tandem allylboration/lactonization approach was achieved using a chiral N,N′-dioxide/AlIII complex. The kinetic resolution of the allylboration intermediate via asymmetric lactonization was found to be a key aspect responsible for the success of this transformation. Stereodivergent syntheses and total syntheses of eupomatilones 2, 5 and
使用手性N , N ' -二氧化物/Al III络合物,通过串联烯丙基硼化/内酯化方法实现了 α-亚甲基-γ-丁内酯的不对称合成。发现烯丙基硼化中间体通过不对称内酯化的动力学拆分是该转化成功的关键因素。对Eupomatilones 2、5和6的立体发散合成和全合成证明了其合成实用性。
LAMBERT, FRANCOIS;KIRSCHLEGER, BERNARD;VILLIERAS, JEAN, J. ORGANOMET. CHEM., 406,(1991) N-2, C. 71-86
作者:LAMBERT, FRANCOIS、KIRSCHLEGER, BERNARD、VILLIERAS, JEAN