Direct Catalytic Asymmetric Mannich Reaction with Dithiomalonates as Excellent Mannich Donors: Organocatalytic Synthesis of (<i>R</i>)-Sitagliptin
作者:Han Yong Bae、Mun Jong Kim、Jae Hun Sim、Choong Eui Song
DOI:10.1002/anie.201605167
日期:2016.8.26
enantioselectivity (up to 99 % ee). Furthermore, by the use of a DTM, even some highly challenging primary alkyl α‐amidosulfones were smoothly converted into the desired adducts with excellent enantioselectivity (up to 97 % ee), whereas the use of a malonate or monothiomalonate resulted in no reaction under identical conditions. The synthetic utility of the chiral Mannich adducts obtained from primary alkyl substrates
Abstract A synthesis of N‐protected β‐aminomalonates starting from α‐amidosulfones under very mild and simple reaction conditions is described. Treatment of the sulfones with malonate esters in the presence of 2.5 equivalents of potassium carbonate affords the desired products in good yield. A variety of N‐Z and N‐Boc protected aliphatic and aromatic α‐aminosulfones and malonate esters have been successfully
摘要描述了在非常温和和简单的反应条件下,以 α-酰胺砜为原料合成 N 保护的 β-氨基丙二酸酯。在2.5当量碳酸钾存在下用丙二酸酯处理砜以良好收率提供所需产物。多种 N-Z 和 N-Boc 保护的脂肪族和芳香族 α-氨基砜和丙二酸酯已成功用作起始材料。水解伴随着 N 保护的 β-氨基丙二酸酯的脱羧,为获得外消旋 β-氨基酸提供了便利。
The asymmetric vinylogous Mannich reaction of noncyclic dicyanoolefins catalyzed by a bifunctional thiourea–ammonium salt phase transfer catalyst
An efficient enantioselective vinylogous Mannichreaction of N-Boc aminosulfones with noncyclic α,α-dicyanoolefins has been realized using an extraordinary bifunctional thiourea–ammonium salt phase transfer catalyst derived from quinine. A variety of N-Boc aminosulfones and α,α-dicyanoolefins were investigated, and the corresponding products were obtained in excellent yields (up to 99% yield) with
N -Boc氨基砜与非环状α,α-二氰基烯烃的高效对映选择性乙烯基类Mannich反应已使用衍生自奎宁的非常规双官能硫脲-铵盐相转移催化剂实现。研究了各种N -Boc氨基砜和α,α-二氰基烯烃,并以优异的收率(最高99%的收率)和优异的对映选择性(最高ee的98%)获得了相应的产物。所需产物可以容易地转化成有价值的氨基酮。
베타-아미노-다이싸이오에스터 화합물의 제조방법 및 이에 의해 제조된 베타-아미노-다이싸이오에스터 화합물
申请人:Research & Business Foundation SUNGKYUNKWAN UNIVERSITY 성균관대학교산학협력단(220050013604) BRN ▼101-82-12009
公开号:KR20170093017A
公开(公告)日:2017-08-14
N-프로텍티드-베타-아미노-다이싸이오에스터 화합물의 제조방법이 개시된다. N-프로텍티드-베타-아미노-다이싸이오에스터 화합물을 제조하기 위하여, 스퀘어아마이드 작용기와 퀴누클리딘 작용기를 포함하는 키랄 촉매의 존재 하에 마니히 반응에 따라 다이싸이오말로네이트와 N-프로텍티드-이민 또는 N-프로텍티드-알파-아미도설폰를 비대칭 반응시킬 수 있다. 이러한 제조방법에 따르면, 종래의 금속 촉매에 비해 현저하게 저렴하고 안전한 촉매를 이용하여 높은 광학 선택성으로 키랄성 N-프로텍티드-베타-아미노-다이싸이오에스터를 높은 수율로 합성할 수 있다.