开发了使用烯丙基硼酸对N-叔丁烷亚磺酰基 α-亚氨基酯进行非对映选择性烯丙基化,以获得具有良好收率和非对映选择性的光学活性非蛋白原 α-氨基酸前体。革兰氏规模合成、广泛的官能团耐受性、出色的立体发散性、合成后修饰以及手性助剂的轻松去除是其中的一些关键亮点。该协议适用于各种氨基酸和短肽,导致这些前体在 N 端位置的结合。
Indium-assisted aluminium-based stereoselective allylation of prostereogenic α,α-disubstituted cycloalkanones and imines
作者:Chennakesava Reddy、Srinivasarao Arulananda Babu、Nayyar Ahmad Aslam
DOI:10.1039/c4ra04293j
日期:——
Al0 for the allylation of a variety of prostereogenic α,α-disubstituted (hindered) cycloalkanones, 1,2-dione-based systems and various imino systems (CN functional groups) is reported. The stereoselective InCl3-catalyzed Al-based allylation of various 2-substituted-2-carbethoxycycloalkanones gave the corresponding products with moderate to excellent diastereoselectivity. The allylation and propargylation
Dramatic lithium chloride effect on the reaction stereocontrol in Zn-mediated asymmetric cinnamylation: highly practical synthesis of β-aryl homoallylic amines
作者:Min Liu、An Shen、Xing-Wen Sun、Fei Deng、Ming-Hua Xu、Guo-Qiang Lin
DOI:10.1039/c0cc03230a
日期:——
An extremely mild and practical approach for the preparation of enantiomerically enriched beta-aryl substituted homoallylic amines bearing two adjacent stereogeniccenters was realized by room temperature zinc-mediated highlystereoselective cinnamylation of N-sulfinyl imines.
Synthesis of β-Amino Ketones by Addition of Aryl Methyl Ketones to Sulfinimines: Application to the Total Synthesis of HPA-12, Norsedamine, and Sedamine
作者:Arava Amaranadha Reddy、Kavirayani R. Prasad
DOI:10.1021/acs.joc.7b02611
日期:2017.12.15
Synthesis of β-sulfinamido ketones was accomplished by the addition of silyl enol ethers derived from arylmethyl ketones to chiral sulfinimines in excellent yield and selectivity. Application of the formed β-amino substituted ketones is exemplified in the totalsynthesis of sphingolipid HPA-12 and the sedamine alkaloids.