Reactivity as glycine templates of 1,2-dialkyl-2,4-dihydro-1H-pyrazino[2,1-b]quinazoline-3,6-diones
摘要:
The 1-methyl(iso-propyl)-2-benzyl-2,4-dihydro-1H-pyrazino[2,1-b]quinazoline-3,6-diones 8 and 9 could be regio- and diastereoselectively alkylated at C(4) with retention of configuration at both stereocentres. (C) 2002 Elsevier Science Ltd. All rights reserved.
Reactivity as glycine templates of 1,2-dialkyl-2,4-dihydro-1H-pyrazino[2,1-b]quinazoline-3,6-diones
摘要:
The 1-methyl(iso-propyl)-2-benzyl-2,4-dihydro-1H-pyrazino[2,1-b]quinazoline-3,6-diones 8 and 9 could be regio- and diastereoselectively alkylated at C(4) with retention of configuration at both stereocentres. (C) 2002 Elsevier Science Ltd. All rights reserved.
A series of racemic dipodazine analogues 9 were prepared in 22–80% yield from (3Z,6RS)-3-[(dimethylamino)methylidene]-6-methyl-1-(phenylmethyl)piperazine-2,5-dione (7) (Scheme 1), which was prepared in four steps from (RS)-alanine methyl ester hydrochloride. The preparation of nonracemic 7 from (S)-alanine methyl ester hydrochloride failed, since the introduction of the enamino functionality at position
Reactivity as glycine templates of 1,2-dialkyl-2,4-dihydro-1H-pyrazino[2,1-b]quinazoline-3,6-diones
作者:Félix L. Buenadicha、Carmen Avendaño、Mónica Söllhuber
DOI:10.1016/s0957-4166(01)00515-8
日期:2001.11
The 1-methyl(iso-propyl)-2-benzyl-2,4-dihydro-1H-pyrazino[2,1-b]quinazoline-3,6-diones 8 and 9 could be regio- and diastereoselectively alkylated at C(4) with retention of configuration at both stereocentres. (C) 2002 Elsevier Science Ltd. All rights reserved.