ChemInform Abstract: Synthetic Applications of Bis(iminophosphoranes) - Preparation of Some Derivatives of the 11H-Quinazolino(2,3-b)- and Quinazolino(4,3-b) quinazoline Ring Systems.

Synthetic Applications of Bis(iminophosp

Synthetic Applications of Bis(iminophosphoranes) – Preparation of Some Derivatives of the 11H-Quinazolino[2,3-b]- and Quinazolino[4,3-b]quinazoline Ring Systems

✍ Molina, Pedro ;Conesa, Carlota ;de los Desamparados Velasco, M. 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 455 KB

## Abstract Aza Wittig reaction of bis(iminophosphorane) 3 with two equivalents of aryl isocyanates directly provided the bicyclic guanidines 4. However, 3 undergoes intramolecular aza Wittig reaction on thermal treatment to give the iminophosphorane 6 derived from the 2‐(__o__‐azidophenyl)‐4(3__H_

ChemInform Abstract: Synthesis of the Bi

ChemInform Abstract: Synthesis of the Bi-Heterocyclic Parent Ring System 1,2,4-Triazolo[4,3-b][1,2,4,5]tetrazine and Some 3,6-Disubstituted Derivatives.

✍ David E. Chavez; Michael A. Hiskey 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 31 KB 👁 2 views

ChemInform Abstract: The Fate of the Try

ChemInform Abstract: The Fate of the Tryptophan Stereocenter in the Synthesis of 7,10,16,16a-Tetrahydro-11H-quinazolino[2′,3′:3,4]pyrazino [1,2-b]β-carboline-5,8-diones.

✍ Antonio Madrigal; Mercedes Grande; Carmen Avendano 📂 Article 📅 2001 🏛 John Wiley and Sons ⚖ 38 KB 👁 2 views

## Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable v

Synthesis of the bi-heterocyclic parent

Synthesis of the bi-heterocyclic parent ring system 1,2,4-triazolo[4,3-b][1,2,4,5]tetrazine and some 3,6-disubstituted derivatives

✍ David E. Chavez; Michael A. Hiskey 📂 Article 📅 1998 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 236 KB

## Abstract The synthesis of the previously unknown parent ring system was developed. Treatment of 3‐hydrazino‐1,2,4,5‐tetrazine (4) with diethoxymethyl acetate gave the parent ring system. Similar treatment of 3‐(3,5‐dimethylpyrazol‐1‐yl)‐6‐hydrazino‐1,2,4,5‐tetrazine (2) with one carbon cyclizing

ChemInform Abstract: Stereochemical Issu

ChemInform Abstract: Stereochemical Issues Related to the Synthesis of 7,10-Dimethyl-7,10,16,16a-tetrahydro-11H-quinazolino [2′,3′:3,4]pyrazino[1,2-b]β-carboline-5,8-diones.

✍ A. MADRIGAL; M. GRANDE; C. AVENDANO 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 37 KB 👁 2 views

Stereochemical Issues Related to the Synthesis of 7,10- 10,16,3':3,4]pyrazino[1,2-b]βcarboline-5,8-diones. -The condensation of iminoethers like (III) with anthranilic acid proceeds with inversion of the tryptophan stereocenter C-16a. Epimerization of the tryptophan center also occurs by acylation

ChemInform Abstract: Application of [5 +

ChemInform Abstract: Application of [5 + 2] Cycloaddition Toward the Functionalized Bicyclo[4.3.1]decane Ring System: Synthetic Study of Phomoidride B (CP-263,114).

✍ Naoki Ohmori 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 44 KB 👁 2 views

## Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable v