Double intramolecular hetero Diels–Alder reactions of α,β-unsaturated hydrazones as 1-azadienes: a new route to 2,2′-bipyridines
作者:Nicholas Bushby、Christopher J. Moody、David A. Riddick、Ian R. Waldron
DOI:10.1039/b105409k
日期:——
Salicylaldehyde was converted into the O-propynyl- and O-butynyl α,β-unsaturated aldehydes 4 and ketones 6, subsequent reaction of which with N,N-dimethylhydrazine and alkyne homocoupling gave the 1,3-diyne bis(hydrazones) 8, substrates for a double intramolecular hetero Diels–Alderreaction. Similar substrates 11, 15a/15c and 15b/15d were prepared from 2-(N-benzoylamino)cinnamaldehyde, hex-5-ynol and hept-6-ynol
New Preparation of Diethyl Methylformyl-2-phosphonate Dimethylhydrazone: A Reagent for Aldehyde Homologation
作者:Richard J. Petroski
DOI:10.1080/00397910903531797
日期:2010.12.21
The phosphonate reagent diethyl methylformyl-2-phosphonate dimethylhydrazone contains a protected aldehyde group instead of the usual ester group. It can be used for the two-carbon homologation of aldehydes to α, β-unsaturated aldehydes. The reagent can be prepared in good overall yield (82%) and purity by deprotection of commercially available diethyl-2,2-(diethoxy)ethylphosphonate with p-toluenesulfonic
Double intramolecular Diels–Alder reaction of α,β-unsaturated hydrazones: a new route to 2,2′-bipyridines
作者:Nicholas Bushby、Christopher J. Moody、Christopher J. Moody、David A. Riddick、Ian R. Waldron
DOI:10.1039/a901641d
日期:——
Heating the 1,3-diynyl bis-α,β-unsaturated hydrazones 3, 6 and 10 results in double intramolecular DielsâAlder reaction of the 1-azadienes, and after aromatisation by loss of dimethylamine, the formation of bipyridines 11â14.
作者:Robert K. Boeckman、Hui Wang、Kyle W. Rugg、Nathan E. Genung、Ke Chen、Todd R. Ryder
DOI:10.1021/acs.orglett.6b03137
日期:2016.12.2
The convergent total synthesis of the manzamine alkaloid (−)-nakadomarin A (1) is described. The retrosynthetic analysis recognized spirocycle 3, assembled via an organocatalyst-promoted Michaeladdition/cyclization between bicyclic lactam 4 and furan aldehyde 5, both accessible from achiral starting materials and on a multigram scale. Lactam 4 is assembled through an SN2′/reduction/Staudinger/retro-aza-Claisen
描述了manzamine生物碱(-)-nakadomarin A(1)的会聚全合成。逆向合成分析确认了螺环3,其通过有机催化剂促进的双环内酰胺4和呋喃醛5之间的迈克尔加成/环化而组装,两者均可从非手性起始原料获得并且以克数表示。内酰胺4通过S N 2'/还原/ Staudinger /复古-氮杂-Claisen序列按比例组装。螺环化后,nakadomarin的合成仅需六个步骤即可完成。
Liorber, B. G.; Zverev, V. V.; Khamatova, Z. M., Journal of general chemistry of the USSR, 1990, vol. 60, # 8.1, p. 1572 - 1576
作者:Liorber, B. G.、Zverev, V. V.、Khamatova, Z. M.、Pavlov, V. A.、Alparova, M. V.、Vakar, V. M.