描述了C 2对称的手性O,N,N,O-四齿2,2-联吡啶二醇二醇丙烷配体的合成。Mukaiyama–Michael反应被用作合成2,2-联吡啶丙烷9的重要反应。在合成的配体中,配体11在二乙基锌和各种醛类化合物中均表现出出色的手性诱导(至多97%ee)。对于本催化体系,不需要在二乙基锌加成反应中使用额外的路易斯酸,例如Ti(O i Pr)4。
[EN] BRYOSTATIN COMPOUNDS AND METHODS OF PREPARING THE SAME<br/>[FR] COMPOSÉS DE BRYOSTATINE ET PROCÉDÉS DE PRÉPARATION CORRESPONDANTS
申请人:UNIV LELAND STANFORD JUNIOR
公开号:WO2018067382A1
公开(公告)日:2018-04-12
Methods for preparing a variety of bryostatin compounds are provided. The subject methods provide for preparation of bryostatin 1 in multi-gram quantities in a low and unprecedented number of convergent synthetic steps from commercially available materials. The subject methods are scalable with low estimated material costs and can provide enough material to meet clinical needs. Also provided are a variety of bryostatin analog compounds, and prodrug forms thereof, which are synthetically accessible via the subject methods and pharmaceutical compositions including the same.
oxidative coupling protocol. Highly selective formation of mono-enol silyl ethers of 3,3-disubstituted acetylacetones was achieved using 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) as a base. Subsequent silver(i) oxide mediated coupling reactions provided tetraketones. Unique substituent dependence was found for the terminal-selective silylation of tetraketones. Finally, octaketones (tetramers of acetylacetone
le Goaller,R.; Dierre,J.-L., Canadian Journal of Chemistry, 1977, vol. 55, p. 757 - 765
作者:le Goaller,R.、Dierre,J.-L.
DOI:——
日期:——
Novel C2-symmetric chiral O,N,N,O-tetradentate 2,2-bipyridyldiolpropane ligands: synthesis and application in asymmetric diethylzinc addition to aldehydes
作者:Yi-Shan Shih、Ramalingam Boobalan、Chinpiao Chen、Gene-Hsian Lee
DOI:10.1016/j.tetasy.2013.12.020
日期:2014.2
C2-symmetric chiralO,N,N,O-tetradentate 2,2-bipyridyldiolpropane ligands is described. The Mukaiyama–Michael reaction was applied as an important reaction for the synthesis of 2,2-bipyridylpropane 9. Among the ligands synthesized, ligand 11 exhibits excellent chiral induction (up to 97% ee) in diethylzincaddition to various aldehydes. The use of additional Lewis acid such as Ti(OiPr)4 in diethylzinc addition
描述了C 2对称的手性O,N,N,O-四齿2,2-联吡啶二醇二醇丙烷配体的合成。Mukaiyama–Michael反应被用作合成2,2-联吡啶丙烷9的重要反应。在合成的配体中,配体11在二乙基锌和各种醛类化合物中均表现出出色的手性诱导(至多97%ee)。对于本催化体系,不需要在二乙基锌加成反应中使用额外的路易斯酸,例如Ti(O i Pr)4。
Two-Step Transformation of Aliphatic Polyketones into π-Conjugated Polyimines
changed their absorption and metal-coordination behaviors. Finally, this two-step transformation was applied to polydisperse polymers. Imine formation proceeded almost quantitatively, even for longer polyketones, including docosamer. Subsequent oxidation of the polyimines furnished a virtually insoluble material that showed broad and red-shifted solid-state absorption over the whole visible region resulting