1,1-Bis(benzotriazolyl) derivatives as gem-dianion synthons
摘要:
Bis(benzotriazolyl)methylbenzenes la,b were converted by excess lithium metal in the presence of ketones into the 1,3-diols 3a-g in moderate to good yields. However, similar treatment of 5 gave only the mono reduction products 6, 7. Compounds la,b reacted with 1 equivalent of diketone 8 to form olefins 10a,b. (C) 1998 Elsevier Science Ltd. All rights reserved.
Benzotriazole-Assisted Aromatic Ring Annulation: Efficient and General Syntheses of Polysubstituted Naphthalenes and Phenanthrenes
作者:Alan R. Katritzky、Guifen Zhang、Linghong Xie
DOI:10.1021/jo961597x
日期:1997.2.1
4-addition to alpha,beta-unsaturated aldehydes and ketones. Intramolecular cyclization of the products, induced by acetic acid-hydrobromic acid or polyphosphoric acid (PPA), followed by simultaneous dehydration and debenzotriazolylation furnishes a wide range of polysubstituted naphthalenes 7a-f and of phenanthrenes 9 and 11 in moderate to good yields in one-pot procedures. If compounds 1 are first lithiated
Benzotriazole-Mediated Stereoselective Olefination of Carboxylic Esters: Transformation of α-Amino Acid Esters into Chiral Allylamines
作者:Alan R. Katritzky、Dai Cheng、Jianqing Li
DOI:10.1021/jo971546f
日期:1998.5.1
Diastereoselective trans-olefinations of carboxylic esters 3a-h have been accomplished using benzylic or allylic benzotriazole derivatives la-e to prepare alpha-(benzotriazol-1-yl) ketones 4a-i, for the subsequent reduction of 4a-i, and finally for low-valent titanium-effected dehydroxybenzotriazolylation.(1) N-Protected alpha-amino acid esters 9a-c and 15 thus give allylamines 13a-e and 19 with virtually full retention of chirality. Mechanistic aspects of the dehydroxybenzotriazolylation are discussed.
US5233046A
申请人:——
公开号:US5233046A
公开(公告)日:1993-08-03
US5374701A
申请人:——
公开号:US5374701A
公开(公告)日:1994-12-20
[EN] DIARYLACETYLENES, ENAMINES AND ACETYLENIC POLYMERS AND THEIR PRODUCTION
申请人:HAY, Alan, S.
公开号:WO1993009079A1
公开(公告)日:1993-05-13
(EN) Diarylacetylenes and diarylenamines are synthesized from a Schiff's base and an N-arylmethylheterocycle; these compounds are useful as intermediates for a variety of polymers; in particular an efficient process is provided for producing diaryl acetylenes useful in the efficient production of acetylene group-containing polymers which can be cross-linked to produce high strength polymers free of structural defects such as conventionally arise as a result of liberation of volatiles during the cross-linking.(FR) Des diarylacétylènes et des diarylénamines sont synthétisés à partir d'une base de Schiff et d'un hétérocycle N-arylméthyle. Ces composés peuvent être utilisés comme intermédiaires pour une variété de polymères. On décrit en particulier un procédé efficace permettant de produire des acétylènes de diaryle pouvant être utilisés pour la production efficace de polymères contenant des groupes acétylène et pouvant être réticulés pour produire des polymères hautement résistants et dépourvus de défauts structuraux qu'entraîne généralement la libération de produits volatils au cours de la réticulation.