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
复制标题
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
DOI:
--
复制
发表时间:
2010
期刊:
影响因子:
--
通讯作者:
J. Heinicke
中科院分区:
文献类型:
--
作者:
M. S. Adam;P. Jones;J. Heinicke
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.
影响因子:
18.3
作者:
Martin, Ruben;Buchwald, Stephen L.
通讯作者:
Buchwald, Stephen L.
影响因子:
18.3
作者:
Fu, Gregory C.
通讯作者:
Fu, Gregory C.
影响因子:
18.3
作者:
Hartwig, John F.
通讯作者:
Hartwig, John F.