2-c]thiazol-7-one, respectively. These compounds were shown to be masked aldehydes. Their reactions with phenylhydrazine and hydroxylamine yielded corresponding hydrazones and oximes, whereas condensation with malononitrile furnished 2-amino-5a,6,7,8-tetrahydro-5-oxo-5H-pyrido[3,2-b]pyrrolizine-3-carbonitrile and 2-amino-5a,6-dihydro-5H,8H-thiazolo[3′,4′:1,5]pyrrolo[2,3-b]pyridine-3-carbonitrile. acylations
发现(1,3-二氢-1,3-二甲基-2 H-苯并咪唑-2-亚乙基)乙腈与N -Boc脯氨酸和4-噻唑烷羧酸的混合酸酐酰化在环外碳原子上进行,得到相应的C-酰基衍生物。用等摩尔量的盐酸除去保护基团,同时进行环化反应,得到2-(3-氨基-5,6,7,7a-四氢-1-氧代-1 H-吡咯嗪-2-基)-和2-( 5-氨基-7,7a-二氢-7-氧代-1 H,3 H-吡咯并[1,2 - c ]噻唑-6-基)-1,3-二甲基苯并咪唑氯化物。用硼氢化钠还原制备的盐,得到3-氨基-2-(2,3-二氢-1,3-二甲基-1 H-苯并咪唑-2-基)-5,6,7,7a-四氢-1 H-吡咯嗪-1-酮和5-氨基-6-(2,3-二氢-1,3-二甲基-1 H-苯并咪唑-2-基)-1,7a-二氢-3 H,7 H-吡咯并[1,2 - c ]噻唑-7-one。这些化合物显示为掩蔽的醛。他们与苯肼和羟胺的反应生成相应的和肟,而与丙二腈缩合可生成2-氨基-5a,6
Synthesis of Masked 2-Amino-3-furancarboxaldehydes
with sodium borohydride afforded 5-substituted 3-(1,3-dimethyl-2,3-dihydro-1H-benzimidazol-2-yl)-2-furanamines. The latter were shown to be masked amino aldehydes. Thus, the corresponding 2-amino-3-furancarboxaldehyde phenylhydrazones and semicarbazones were obtained upon treatment with phenylhydrazine and semicarbazide, respectively, whereas condensation with malononitrile yielded 2-substituted 6-aminofuro[2
in refluxing acetic acid afforded 2-(6-amino-2-bromo-4-hydroxypyridin-3-yl)-substituted quaternary salts of benzimidazolium, benzothiazolium, and thiazolium. Their structures were confirmed unambiguously by X-ray crystallographic studies. Reduction of these quaternary salts with excess sodiumborohydride yielded the corresponding dihydro (in the case of benzoazoles) or tetrahydro (in the case of thiazole)
Rudnev, M. I.; Kurbatov, V. P.; Chub, N. K., Journal of general chemistry of the USSR, 1988, vol. 58, # 10, p. 2077 - 2083
作者:Rudnev, M. I.、Kurbatov, V. P.、Chub, N. K.、Osipov, O. A.
DOI:——
日期:——
Synthesis of spiro 2-(5-amino-2,3-dihydro-3-oxopyrrol-4-yl)-1,3-dialkylbenzimidazolium chlorides
作者:Alexey V. Dobrydnev、Yulian M. Volovenko、Alexandr V. Turov、Volodymyr V. Medviediev、Oleg V. Shishkin、Tatyana A. Volovnenko
DOI:10.1007/s00706-015-1438-3
日期:2015.6
The interaction of 1,3-dialkyl-2,3-dihydro-1H-benzo[d]imidazol-2-ylidenemethyl cyanides with N-trifluoroacylated acid chlorides gave the desired (3-cyano-2-oxo-3-hetarylpropyl)-2,2,2-trifluoroacetamides that upon detrifluoroacetylation provided the target 2-(5-amino-2,3-dihydro-3-oxopyrrol-4-yl)-1,3-dialkylbenzimidazolium chlorides.[GRAPHICS]