(BISTRO) 1 to succinic anhydride led to spirolactone 2 [(+/-)-6,9-divinyl-1-oxaspiro[4.4]nonan-2-one]. Methoxycarbonylation followed by stereoselective alkylation by various benzocyclobutenes afforded the substituted benzocyclobutene steroid precursors 5. Thermolysis of 5 gave rise to steroids (+/-)-6 with a trans-anti-cis configuration in five steps and in a highly stereoselective manner. Modifications
Formation of substituted benzocyclobutenes through flash vacuum pyrolysis
作者:Peter Schiess、Suzanne Rutschmann、Van Vien Toan
DOI:10.1016/s0040-4039(00)88653-0
日期:1982.1
Benzocyclobutenes carrying a substituent in the four membered ring are obtained in high yield from 2-methyl benzaldehydes through a reaction sequence involving a pyrolytic 1,4-elimination of HCl in the crucial step.
1-Aminobenzocyclobutene-1-phosphonic Acid and Related Compounds as Inhibitors of Phenylalanine Ammonia-Lyase
作者:Jerzy Zoń、Piotr Miziak
DOI:10.1002/cbdv.201600488
日期:2017.5
Five new geminal aminocycloalkanephosphonic acids (4 – 8) containing both an aromatic ring and a cycloalkane ring were synthesized and evaluated as potential inhibitors of buckwheat phenylalanine ammonia‐lyase (PAL). Within the set of compounds which are related to 2‐aminoindane‐2‐phosphonic acid (AIP, 3), a known powerful inhibitor of PAL, racemic 1‐aminobenzocyclobutene‐1‐phosphonic acid (4), was
Regioselectivity and Mechanism of Dihalocarbene Addition to Benzocyclopropene
作者:Marina Khrapunovich、Ekaterina Zelenova、Lillian Seu、Alexis N. Sabo、Aidan Flaherty、Dina C. Merrer
DOI:10.1021/jo071203+
日期:2007.9.1
regioselectively to aryl-substituted benzocyclopropenes to produce dihalobenzocyclobutenes. The regioselectivity of addition is not due to steric effects but depends on the electronic donor or acceptor ability of the substituent. B3LYP/6-31G* calculations show preferential :CCl2 addition to substituted benzocyclopropene through electrophilic attack on the benzocyclopropene π-system (Ea = 1.1−2.4 kcal/mol)
二卤代卡宾向区域选择性地加成芳基取代的苯并环丙烯,以生产二卤代苯并环丁烯。加成的区域选择性不是由于空间效应,而是取决于取代基的电子给体或受体能力。B3LYP / 6-31G *计算表明:通过对苯并环丙烯π系统的亲电攻击(E a = 1.1-2.4 kcal / mol),CCl 2可优先添加到取代的苯并环丙烯中,而不是将C-Cσ键插入环丙烯基部分中(E a = 5-24 kcal / mol)。π-加成通过一个过渡态选择性地向亚二甲苯中间体或直接向苯并环丁烯产物进行。