Mannich base derivatives of bioactive benzyl-1,3-benzodioxo-5-ols
作者:Leonard Jurd
DOI:10.1002/jhet.5570220412
日期:1985.7
4-Methylenedioxyphenol (sesamol) reacts with equimolecular quantities of an aromatic aldehyde and morpholine or piperidine in methanol to give Mannich bases 7 and 8, related to insect growth regulators and anti-leukemic and antimitotic benzyl-1,3-benzodioxole derivatives.
New anti-tumor agents.<b>2</b>. Benzopyranylamine compounds
作者:Leonard Jurd
DOI:10.1002/jhet.5570330660
日期:1996.11
condense with a variety of amine, aniline and hydrazine derivatives to form diverse isomeric benzopyrans of types of 9 and 10. The benzopyrans 4–9 which contain a 3,4,5-trimethoxyphenyl ring are active anti-tumor agents, particularly against human breast, CNS and colon cancer cell lines, total growth inhibition of these tumors often occurring in vitro at concentrations as low as 10−5-10−6 moles/1. Because
Palladium-Catalyzed Intermolecular Asymmetric Dearomative Annulation of Phenols with Vinyl Cyclopropanes
作者:Wen-Dao Chu、Tian-Tian Liang、Hao Ni、Zhi-Hong Dong、Zhihui Shao、Yong Liu、Cheng-Yu He、Ruopeng Bai、Quan-Zhong Liu
DOI:10.1021/acs.orglett.2c01594
日期:2022.7.15
Herein, we report the Pd(0)-catalyzed intermolecularasymmetric dearomative [3 + 2] annulation of phenols with vinyl cyclopropanes via in situ generated ortho-quinone methide intermediates. A series of highly functionalized spiro-[5,6] bicycles which bear three contiguous stereogenic centers including one all-carbon quaternary were obtained with excellent stereoselectivities. Density functional theory
Asymmetric Synthesis of Triarylmethanes by Rhodium-Catalyzed Enantioselective Arylation of Diarylmethylamines with Arylboroxines
作者:Yinhua Huang、Tamio Hayashi
DOI:10.1021/jacs.5b03277
日期:2015.6.24
where Ar(1) is substituted with a 2-hydroxy group, with arylboroxines (Ar(3)BO)3 in the presence of a chiral diene-rhodium catalyst gave high yields of chiral triarylmethanes (Ar(1)Ar(2)CH*Ar(3)) with high enantioselectivity (up to 97% ee). The reaction is assumed to proceed through o-quinone methide intermediates which undergo Rh-catalyzed asymmetric 1,4-addition of the arylboron reagents.
Carbene and Acid Cooperative Catalytic Reactions of Aldehydes and <i>o</i>-Hydroxybenzhydryl Amines for Highly Enantioselective Access to Dihydrocoumarins
作者:Xingkuan Chen、Runjiang Song、Yingguo Liu、Chong Yih Ooi、Zhichao Jin、Tingshun Zhu、Hongling Wang、Lin Hao、Yonggui Robin Chi
DOI:10.1021/acs.orglett.7b02883
日期:2017.11.3
A highly enantioselective method for quick access to dihydrocoumarins is reported. The reaction involves a cooperative catalytic process with carbene and in situ generated Brønsted acid as the catalysts. α-Chloro aldehyde and readily available and stable o-hydroxybenzhydryl amine substrates were used to generate reactive azolium ester enolate and ortho-quinone methide (o-QM) intermediates, respectively