A highly efficient phase-transfer catalytic aza-Michael addition of tert-butyl benzyloxycarbamate to a wide range of electron-deficient olefins is presented (90-99%).
Intermolecular Aminocarbonylation of Alkenes using Concerted Cycloadditions of Iminoisocyanates
作者:Amanda Bongers、Christian Clavette、Wei Gan、Serge I. Gorelsky、Lyanne Betit、Kaitlyn Lavergne、Thomas Markiewicz、Patrick J. Moon、Nicolas Das Neves、Nimrat K. Obhi、Amy B. Toderian、André M. Beauchemin
DOI:10.1021/acs.joc.6b02713
日期:2017.1.20
that the LUMO of the iminoisocyanate is reacting with the HOMO of the alkene. Computational and experimental results support a concerted asynchronous [3 + 2] cycloaddition involving an iminoisocyanate, which was observed for the first time by FTIR under the reaction conditions. The products of this reaction are complex azomethineimines, which are precursors to valuable β-amino carbonyl compounds such
Synthesis of boronophenylalanine-like aza-amino acids for boron-containing azapeptide precursors
作者:Kota Miyata、Airi Narita、Ryota Fujisawa、Makoto Roppongi、Satoshi Ito、Tamesue Shingo、Toru Oba
DOI:10.1016/j.tetlet.2020.152585
日期:2020.12
Aza-amino acids and an azapeptide with a boron-containing substituent were developed for the first time. We synthesized p-boronophenylalanine (BPA)-like aza-amino acid (aza-BPA) and its analogs in which the α-carbon of the peptide is replaced by nitrogen and the boronate ester is situated at the ortho, meta, or para position of the phenyl group. The N- and C-terminals of aza-BPA were linked to α-amino
A C–H activation-based strategy has been developed for the synthesis of N-amino azaheterocycles. Rh(III)-catalyzed coupling of N-Boc hydrazones/N-Boc hydrazines with diazodiesters/diazoketoesters provides convenient access to synthetically and medicinally important compounds, N-amino isoquinolin-3-ones and N-amino indoles, by harnessing N-tert-butyloxycarbonyl (N-Boc) cleavage as an adaptable reactivity
Pd(ii)-catalyzed direct C–H acylation of N-Boc hydrazones with aldehydes: one-pot synthesis of 1,2-diacylbenzenes
作者:Satyasheel Sharma、Aejin Kim、Jihye Park、Mirim Kim、Jong Hwan Kwak、Young Hoon Jung、Jung Su Park、In Su Kim
DOI:10.1039/c3ob41644e
日期:——
A palladium(II)-catalyzed directacylation of acetophenone N-Boc hydrazones with aldehydes via C–H bond activation is described. This protocol provides direct access to a range of 1,2-diacylbenzenes, which are useful precursors to construct biologically interesting and pharmaceutically important compounds.