实现了非天然三肽作为靛红的不对称醛醇缩合反应的高度对映选择性有机催化剂的开发。以d-丙氨酸残基为C末端氨基酸残基的H-Pro-Gly- d -Ala-OH表现出最佳的对映选择性。H-Pro-Gly- d -Ala-OH催化的靛红反应生成的各种羟醛加合物的收率高达93%,ee高达97%。通过DFT计算对过渡态的研究表明,通过d-丙氨酸控制的空间环境实现了高光学纯度。
Unnatural tripeptide as highly enantioselective organocatalyst for asymmetric aldol reaction of isatins
作者:Kazumasa Kon、Yoshihito Kohari、Miki Murata
DOI:10.1016/j.tetlet.2018.12.049
日期:2019.1
The development of unnatural tripeptides as highly enantioselective organocatalysts for the asymmetricaldolreaction of isatins was achieved. H-Pro-Gly-d-Ala-OH with the d-alanine residue as the C-terminal amino acid residue expressed the best enantioselectivity. The H-Pro-Gly-d-Ala-OH-catalyzed reaction of isatins gave various aldol adducts with up to 93% yield and up to 97% ee. Investigation of the
实现了非天然三肽作为靛红的不对称醛醇缩合反应的高度对映选择性有机催化剂的开发。以d-丙氨酸残基为C末端氨基酸残基的H-Pro-Gly- d -Ala-OH表现出最佳的对映选择性。H-Pro-Gly- d -Ala-OH催化的靛红反应生成的各种羟醛加合物的收率高达93%,ee高达97%。通过DFT计算对过渡态的研究表明,通过d-丙氨酸控制的空间环境实现了高光学纯度。
Bis-heteroannulation. 15. Enantiospecific syntheses of (+)- and (-)-norsecurinine
作者:Peter A. Jacobi、Charles A. Blum、Robert W. DeSimone、Uko E. S. Udodong
DOI:10.1021/ja00014a033
日期:1991.7
(−)-Norsecurinine (2a) has been prepared in a stereospecific fashion with the acetylenic oxazole 39 as the starting material. Diels-Alder cyclization of 39 afforded the furano ketone 45 that was transformed in five steps to the butenolide mesylate 52. Transannular alkylation of 52 then afforded 2a. In identical fashion, ent-39 gave(+)-norsecurinine (2b)