Pyrido‐Annulated 1,3‐Azaphospholes: Synthesis of 1,3‐Azaphospholo[5,4‐b]pyridines and Preliminary Reactivity Studies

Pyrido‐Annulated 1,3‐Azaphospholes: Synthesis of 1,3‐Azaphospholo[5,4‐b]pyridines and Preliminary Reactivity Studies
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吡啶环化 1,3-氮杂磷酯:1,3-氮杂磷酰基[5,4-b]吡啶的合成和初步反应性研究

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发表时间:
2010
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影响因子:
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通讯作者:
J. Heinicke
J. Heinicke
中科院分区:
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作者:
M. S. Adam;P. Jones;J. Heinicke

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以2-氨基吡啶-3-膦酸二乙酯1为原料,经LiAlH 4还原,再与二甲基甲酰胺和二甲基乙酰胺缩二甲醇环化,合成了含吡啶环的σ 2 -磷杂环化合物1,3-氮杂磷杂[5,4-B]吡啶4和5. P=C-N杂环在OH和NH化合物存在下是稳定的,但在P=C键处添加tBuLi。与1当量的M(CO)5(thf)反应,得到η 1 -P配位的(氮磷[5,4-B]吡啶)M(CO)5配合物(M = Cr,Mo,W)。光谱数据与π-受体性质的优势一致。X-射线晶体结构分析表明,2-氨基-3-膦基吡啶(2a)和NH-功能性氮杂磷杂吡啶(5a)通过N-H···N氢键形成“碱基配对”,并从磷杂烯烃中间体竞争形成1,3-二磷杂环丁烷(6c)。
Pyrido-annulated σ 2 -phosphorus heterocycles, 1,3-azaphospholo[5,4-b]pyridines 4 and 5, were synthesized by reduction of diethyl 2-aminopyridine-3-phosphonates 1 with LiAlH 4 and cyclocondensation of the resulting 2-amino-3-phosphanylpyridines 2 with dimethylformamide and dimethylacetamide dimethyl acetal, respectively, via intermediate phosphaalkenes 3. The P=C-N heterocycles are stable in the presence of OH and NH compounds but add tBuLi at the P=C bond. Reaction with one equivalent of M(CO) 5 (thf) leads to η 1 -P-coordinated (azaphospholo[5,4-b]pyridine)M(CO) 5 complexes (M = Cr, Mo, W). Spectroscopic data are in accordance with the dominance of π-acceptor properties. X-ray crystal structure analyses reveal "base-pairing" of 2-amino-3-phosphanylpyridine (2a) and NH-functional azaphospholopyridine 5a by N-H···N hydrogen bonds, and the competing formation of 1,3-diphosphetane 6c from the phosphaalkene intermediate.
DOI: 10.1021/ar800036s
发表时间: 2008-11-18
影响因子: 18.3
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通讯作者: Buchwald, Stephen L.
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影响因子: 18.3
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