A two-step reaction sequence for the highly stereodivergent construction of 1,3-diamines with three continuous stereocenters is reported. This novel method enables the controlled synthesis of any given diastereomer of the 1,3-diamine scaffold from a simple set of starting materials in a highly modular manner. The disclosed approach is based on the reaction of an enamide with an in situ generated N-acylimine
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 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。
A practical approach to α-aminophosphonates has been developed through an In(OTf)3-catalyzed N-α phosphonylation of N,O-acetals with triethylphosphite 7. Indoline and isoindoline N,O-acetals 6a–6j and 9a–9j and chain N,O-acetals 11a–11p were subjected to a Lewis acid catalyzed N-α phosphonylation process. As a result, the desired α-aminophosphonates 8a–8j, 10a–10j and 12a–12p were obtained in moderate