An efficient synthesis of (E)-(2-arylpyrazino[1,2-a]pyrimidine-4-ylidene)acetonitriles and cyanomethyl appended pyrimidines
摘要:
A series of (E)-(2-arylpyrazino[1,2-a]pyrimidine-4-ylidene)acetonitriles 5a-j and aryl/heteroaryl tethered pyrimidin-4-yl acetonitriles 6a-e has been synthesized in excellent yields through base catalyzed ring transformation of suitably functionalized 2H-pyran-2-ones 3 using 2-aminopyrazine 4a and arylamidinium salts 4b, separately. (c) 2006 Elsevier Ltd. All rights reserved.
An efficient synthesis of (E)-(2-arylpyrazino[1,2-a]pyrimidine-4-ylidene)acetonitriles and cyanomethyl appended pyrimidines
摘要:
A series of (E)-(2-arylpyrazino[1,2-a]pyrimidine-4-ylidene)acetonitriles 5a-j and aryl/heteroaryl tethered pyrimidin-4-yl acetonitriles 6a-e has been synthesized in excellent yields through base catalyzed ring transformation of suitably functionalized 2H-pyran-2-ones 3 using 2-aminopyrazine 4a and arylamidinium salts 4b, separately. (c) 2006 Elsevier Ltd. All rights reserved.
Synthesis of Benzocyclobutanes through Ring Transformation Reactions of 2<i>H</i>-pyran-2-ones
作者:Vishnu Ji Ram、Diptesh Sil、Ashoke Sharon、Ramendra Pratap、Prakas R. Maulik
DOI:10.1055/s-2004-831292
日期:——
A one-pot synthesis of benzocyclobutane (3a-n) has been developed through base-induced ring transformation reactions of 6-aryl-4-substituted-2H-pyran-2-one-3-carbonitriles (1a-c) and methyl 6-aryl-4-methylsulfanyl-2H-pyran-2-one-3-carboxylate (1d) by cyclobutanone.