Highly Enantioselective Intramolecular Cyclopropanation Reactions of N-Allylic-N-methyldiazoacetamides Catalyzed by Chiral Dirhodium(II) Carboxamidates
摘要:
Catalytic diazo decomposition of representative N-allylic-N-methyldiazoacetamides produced the corresponding intramolecular cyclopropanation products in good to excellent yields and with exceptional enantiocontrol. In the simplest case, with N-allyl-N-methyldiazoacetamide, catalysis by dirhodium(II) tetrakis[methyl 2-oxapyrrolidine-5(S)-carboxylate], Rh-2(5(S)-MEPY)(4), achieved the highest yield and enantioselectivity (93% eel. Dirhodium(II) tetrakis[methyl 2-oxo-1-(3-phenylpropanoyl)imidazolidin-4(S)-carboxylate] Rh-2(4S)-MPPIM)(4), was preferred for substituted N-allylic-N-methyldiazoacetamides from which 92-95% ee's were obtained in intramolecular cyclopropanation reactions (88-95% yields), even when the catalyst was employed in only 0.1 mol %, Competition with intramolecular dipolar cycloaddition was minimized with the use of N-methyldiazoacetamides relative to N-tert-butyldiazoacetamides.
Glucosamine-peptide derivatives and their pharmaceutical compositions
申请人:Takeda Chemical Industries, Ltd.
公开号:EP0002677A1
公开(公告)日:1979-07-11
Compounds, of the following formula and their physiologically acceptable salts:
where:
R is hydrogen or a group of the formule R'CO-(wherein
R' is an acyclic hydrocarbon group which may be substituted by a cyclic hydrocarbon group -2.3.2,3-dimethoxty-5-methyl-1,4-benzoquinon-6-YI at its ω-position) or a group of the formula
They have an immunostimulatory activity.
下式化合物及其生理上可接受的盐类:
其中
R 是氢或形式为 R'CO-(wherein
R'为无环烃基,可在ω位被环烃基-2.3.2,3-二甲氧基-5-甲基-1,4-苯醌-6-YI 取代)或式中的基团
它们具有免疫刺激活性。
Ink composition for 3D printing support and 3D printing manufacturing method using the same
申请人:LG Chem, Ltd.
公开号:US10954404B2
公开(公告)日:2021-03-23
The present invention relates to an ink composition for a 3D printing support, comprising an amine-containing monomer and a curing agent. According to the present invention, an ink composition for a 3D printing support, which retains an excellent jetting property, is well dissolved in water after being photo-cured to be easily removed, and has less curing contraction and excellent storage stability, can be provided.
本发明涉及一种用于 3D 打印支架的油墨组合物,由含胺单体和固化剂组成。根据本发明,可提供一种用于 3D 打印支架的油墨组合物,该组合物可保持优异的喷射性能,在光固化后可很好地溶解于水以便于去除,并且具有较小的固化收缩和优异的储存稳定性。
VOSHCHULA, V. N.;TOLKUNOV, S. V.;ZUBRITSKIJ, M. YU.;DULENKO, V. I., XIMIYA GETEROTSIKL. SOED.,(1988) N 10, S. 1414-1419
作者:VOSHCHULA, V. N.、TOLKUNOV, S. V.、ZUBRITSKIJ, M. YU.、DULENKO, V. I.
DOI:——
日期:——
Anti-fouling agent
申请人:Nitto Kasei Co., Ltd.
公开号:EP0091039B1
公开(公告)日:1986-10-01
INK COMPOSITION FOR 3D PRINTING SUPPORT AND 3D PRINTING MANUFACTURING METHOD USING THE SAME
申请人:LG Chem, Ltd.
公开号:US20180215937A1
公开(公告)日:2018-08-02
The present invention relates to an ink composition for a 3D printing support, comprising an amine-containing monomer and a curing agent. According to the present invention, an ink composition for a 3D printing support, which retains an excellent jetting property, is well dissolved in water after being photo-cured to be easily removed, and has less curing contraction and excellent storage stability, can be provided.