Modified Pictet–Spengler reaction. A highly diastereoselective approach to 1,2,3-trisubstituted-1,2,3,4-tetrahydro-β-carbolines using perhydro-1,3-heterocycles
摘要:
A flexible variant of the Pictet-Spengler reaction employing oxazinanes as synthetic equivalents of several carbonyl compounds has been developed. Using acid catalyzed one pot condensation of perhydro-1,3-heterocycles various 1,3-disubstituted and 1,2,3-trisubstituted-1,2,3,4-tetrahydro-beta -carbolines (THBCs) have been synthesized diastereoselectively. (C) 2001 Elsevier Science Ltd. All rights reserved.
Synthesis, activation, and cytotoxicity of aldophosphamide analogs
作者:Richard F. Borch、Ronald R. Valente
DOI:10.1021/jm00114a014
日期:1991.10
tautomerization to an enamine intermediate might provide a mechanistic alternative to the beta-elimination reaction for release of phosphoramide mustard. The 4,4,6-trimethyltetrahydro-1,3-oxazine moiety was selected on the basis of its rapid rate of iminium ion generation and relatively slow rate of hydrolysis. These analogues underwent phosphorodiamidate release by three distinct mechanisms: hydrolysis to aldophosphamide
An expedient protocol of the Biginelli dihydropyrimidine synthesis using carbonyl equivalents
作者:Kamaljit Singh、Jasbir Singh、Prasant K. Deb、Harjit Singh
DOI:10.1016/s0040-4020(99)00760-7
日期:1999.10
A one - pot condensation of perhydro-1,3 heterocycles - aldehyde equivalents with ethyl acetoacetate and ureas provides a convenientsynthesis of the title compounds with a variety of substituents at C-4. Yields are equivalent or significantly higher than the conventional methods.
Pictet–Spengler reaction: is carbonyl the best choice? A highly diastereoselective alternative approach to trans-1,3-disubstituted tetrahydro-β-carbolines
作者:Kamaljit Singh、Prasant K Deb
DOI:10.1016/s0040-4039(00)00751-6
日期:2000.6
Unprecedented 1,2,3-trisubstituted tetrahydro-beta-carbolines (THBCs) have been synthesized via a short and highly diastereoselective synthetic route. The key step of the sequence is a flexible variant of the Pictet-Spengler reaction employing synthetic equivalents of several non-available carbonyl compounds. Using one such synthon, the resultant THBC could be further ring-closed to a tetracyclic indole alkaloidal skeleton. (C) 2000 Elsevier Science Ltd. All rights reserved.
KALYUSKIJ, A. R.;KUZNETSOV, V. V.;GREN, A. I., YKP. XIM. ZH., 54,(1988) N 9, S. 998-999
作者:KALYUSKIJ, A. R.、KUZNETSOV, V. V.、GREN, A. I.
DOI:——
日期:——
Synthesis of aldehydes from dihydro-1,3-oxazines
作者:A. I. Meyers、A. Nabeya、H. W. Adickes、I. R. Politzer、G. R. Malone、A. C. Kovelesky、R. L. Nolen、R. C. Portnoy