A new access to substituted tetraethyl N-Boc 2-aminoethylidene-1,1-bisphosphonates and phosphonyl-substituted aza-Morita–Baylis–Hillman-type adducts
摘要:
A general one-pot synthesis of substituted 2-aminoethylidene-1,1-bisphosphonates has been developed. The protocol involves base-induced addition of sodium tetraethyl methylenebisphosphonate to N-Boc imines generated in situ from N-Boc-alpha-amidoalkyl-p-tolylsulfones by the action of sodium hydride. The direct and efficient conversion of the title compounds into aza-Morita-Baylis-Hillman-type adducts has been also elaborated. (c) 2007 Elsevier Ltd. All rights reserved.
<i>N</i>-Carbamate Protected α-Amidoalkyl-<i>p</i>-tolylsulfones: Convenient Substrates in the aza-Morita−Baylis−Hillman Reaction
作者:Anna Gajda、Tadeusz Gajda
DOI:10.1021/jo801616d
日期:2008.11.7
An efficient and practical one-pot approach to aza-Morita-Baylis-Hillman adducts has been developed. The reaction occurs between N-Boc or N-Cbz imines, generated in situ from stable and easy to handle N-Boc or N-Cbz protected alpha-amidoalkyl-p-tolysulfones, and electron-deficient alkenes in the presence of DABCO. The presented procedure eliminates the use of the relatively unstable N-carbamate imines prior to the coupling reaction. The reaction is limited to alpha-amidosulfones derived from aromatic and heteroaromatic aldehydes.
Highly cis-selective synthesis of iodo-aziridines using diiodomethyllithium and in situ generated N-Boc-imines
作者:James A. Bull、Tom Boultwood、Thomas A. Taylor
DOI:10.1039/c2cc37029h
日期:——
The first preparation of iodoaziridines is described. The addition of diiodomethyllithium to N-Boc-imines affords these novel aziridines in high yields. The reaction proceeds in one-pot via a highly diastereoselective cyclisation of an amino gem-diiodide intermediate.
A new access to substituted tetraethyl N-Boc 2-aminoethylidene-1,1-bisphosphonates and phosphonyl-substituted aza-Morita–Baylis–Hillman-type adducts
作者:Anna Gajda、Tadeusz Gajda
DOI:10.1016/j.tet.2007.11.072
日期:2008.2
A general one-pot synthesis of substituted 2-aminoethylidene-1,1-bisphosphonates has been developed. The protocol involves base-induced addition of sodium tetraethyl methylenebisphosphonate to N-Boc imines generated in situ from N-Boc-alpha-amidoalkyl-p-tolylsulfones by the action of sodium hydride. The direct and efficient conversion of the title compounds into aza-Morita-Baylis-Hillman-type adducts has been also elaborated. (c) 2007 Elsevier Ltd. All rights reserved.