Asymmetric organocatalytic vinylogous Michael addition triggered triple-cascade reactions of 2-hydroxycinnamaldehydes and vinylogous nucleophiles: construction of benzofused oxabicyclo[3.3.1]nonane scaffolds
作者:Hui-Chun Wu、Chen Wang、Ying-Han Chen、Yan-Kai Liu
DOI:10.1039/d0cc07761e
日期:——
An organocatalytic vinylogous Michael addition triggered triple-cascade reaction has been developed. 2-Hydroxycinnamaldehydes worked under iminiumactivation with either acyclic or cyclic ketone-derived α,α-dicyanoalkenes, yielding the benzofused oxabicyclo[3.3.1]nonanes bearing one quaternary stereocenter with excellent stereoselectivities.
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。
Asymmetric Vinylogous Mannich-Type Addition of α,α-Dicyanoalkenes to α-Fluoroalkyl Sulfinyl Imines
作者:Álvaro Sanz-Vidal、Javier Torres、Vadim A. Soloshonok、Yi Zhu、Jianlin Han、Santos Fustero、Carlos del Pozo
DOI:10.1002/adsc.201701284
日期:2018.1.17
The asymmetric vinylogous Mannich reaction (AVMR) of α,α‐dicyanoalkenes with α‐fluoroalkyl sulfinyl imines has been successfully accomplished. This transformation is unprecedented with fluorinated imines and, at the same time, the use of dicyanoalkenes in AVMR has been scarcely reported. Several fluorinated sulfinyl imines are compatible with the process, which gives access to a family of chiral fluorinated
Unexpected metal-free synthesis of trifluoromethyl arenes <i>via</i> tandem coupling of dicyanoalkenes and conjugated fluorinated sulfinyl imines
作者:Alvaro Sanz-Vidal、Daniel Gaviña、Lia Sotorríos、Enrique Gómez-Bengoa、Fernando López Ortiz、María Sánchez-Roselló、Carlos del Pozo
DOI:10.1039/d1cc03161a
日期:——
A novel strategy for the synthesis of policyclic trifluoromethyl arenes has been devised. It involves a DBU-promoted tandem cycloaromatization reaction of dicyanoalkenes and fluorinated conjugated sulfinyl imines. This unprecedented transformation is a metal-free and air-tolerant process that takes place from readily available starting materials under mild reaction conditions.
Domino Reactions with Dicyanoalkenes and Fluorinated Conjugated Sulfinyl Imines. A Convenient Strategy for the Generation of Structural Diversity
作者:Daniel Gaviña、Marcos Escolano、Lía Sotorríos、Enrique Gómez‐Bengoa、Fernando López‐Ortiz、María Sánchez‐Roselló、Carlos del Pozo
DOI:10.1002/adsc.202301123
日期:2024.2.20
compounds are obtained by chemical synthesis. In this context, the use of fluorinated building blocks is one of the most prevalent strategies to introduce fluorine atoms into organic molecules.10 This approach requires small fluorinated molecules, stable and easily available in large scale. Among them, fluorinated imines are one of the most popular building blocks for the synthesis of fluorinated nitrogen-containing