Synthesis of Masked Vicinal Amino Aldehydes of Pyrrolizine and Pyrrolo [1,2-c]thiazole Series
作者:Anton Tverdokhlebov、Alexander Denisenko、Andrey Tolmachev、Yulian Volovenko、Svetlana Shishkina、Oleg Shishkin
DOI:10.1055/s-0028-1088029
日期:2009.4
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