A mild one-pot method for the synthesis of acyclic N-(1-methoxyalkyl)amides starting from carboxylic acids and methyl imidates had been developed and applied to the total synthesis of the insect poison pederine .
A general synthesis of N-acyl-N,O-acetals fromaldehydes, amides and alcohols is reported. This new method consists of two single steps: (a) magnesium-mediated addition of an amide or carbamate to an aldehyde and (b) acid-catalyzed conversion of the N-acylhemiaminal to the N-acyl-N,O-acetal. This two-step protocol allows the multigram synthesis of various N-acyl-O-alkyl-N,O-acetals.
A highly modular, diastereoselective one-pot-synthesis of 1,3-diamines with three contiguous stereogenic centers is reported. Our method provides a fast and efficient access to 1,2-anti-2,3-anti-1,3-diamines from three readily available building blocks. This Bi(OTf)3-catalyzed reaction is insensitive to air and moisture and can be performed on a multigram scale.
A diastereoselective one-pot synthesis of highly substituted dihydropyrimido[2,1-a]isoindole-6(2H)-ones containing three continuous stereocenters is reported. The reaction sequence is based on a hetero-Diels–Alder reaction between an enimide and a N-acylimine followed by an unprecedented Brønsted acid mediated rearrangement of an intermediate 5,6-dihydro-4H-1,3-oxazine to a pyrimido[2,1-a]isoindole
报告了非对映选择性一锅合成的高度取代的二氢嘧啶基[ 2,1- a ]异吲哚-6(2 H)-含有三个连续的立体中心。反应顺序是基于亚胺和N-嘧啶之间的杂Diels-Alder反应,然后是空前的布朗斯台德酸介导的中间体5,6-二氢-4 H -1,3-恶嗪重合成嘧啶基[ 2,1- α ]异吲哚。
Reactions of <b><i>N</i></b>-Acyl Imines with Dihydropyrans
作者:Keith Mead、Sidika Cakir
DOI:10.1055/s-2008-1032209
日期:2008.3
A series of dihydropyranyl acetamides was synthesized by the TFA-catalyzed reaction of dihydropyrans with N-acyl imines.