Three complementary methods offering access to 5-substituted 1,2,3,4-tetrahydroisoquinolines
摘要:
The scope and limitations of three independent though related routes leading to 5-substituted tetrahydroisoquinolines are explored : the Pidet-Spengler type cyclization of ortho-substituted 2-phenylethylamines, the Pomeranz-Fritsch type cyclization of meta-substituted benzylamines and the electrophilic trapping of 5-lithiated 4-lithiooxytetrahydroquinolines. The introduction of the substituent relies in all three cases on a neighboring group assisted site selective metalation step. (C) 1998 Elsevier Science Ltd. All rights reserved.
A new total synthesis of (±) steganone was completed by a route involving the cyclization of a 2,2′-bis(bromoacyl)biaryl derivative.
通过涉及2,2'-双(溴酰基)联芳基衍生物环化的路线,完成了(±)甾烷酮的新的全合成。
Influence of phenyl ring substituents in the cyclometallation of Schiff base ligands: crystal and molecular structures of [Pd-{3,4-(OCH2O)C6H2C(H)N(Cy)-C2,N}(μ-O2CMe)]2 and [Pd-{3,4-(OCH2CH2O)C6H2C(H)N(Cy)-C6,N}(μ-O2CMe)]2
作者:Berta Teijido、Alberto Fernández、Margarita López-Torres、Samuel Castro-Juiz、Antonio Suárez、Juan M. Ortigueira、José M. Vila、Jesús J. Fernández
DOI:10.1016/s0022-328x(99)00680-4
日期:2000.3
Reaction of Pd(OAc)2 with the Schiff base ligands 3,4-O(CH2)nO}C6H3C(H)NR (n=1, 2; R=Cy, 3,4-(OCH2O)C6H3CH2-) leads to dinuclear cyclometallated products in which each palladium atom is C,N bonded to a deprotonated organic ligand, and to two acetate groups which bridge both metal centers. Treatment of 3,4-O(CH2)2O}C6H3C(H)NCH2CH2NMe2 with [PtMe2(COD)] gives mononuclear compounds with the ligand
Pd(OAc)2与席夫碱配体3,4- O(CH 2)n O} C 6 H 3 C(H)NR(n = 1,2; R = Cy,3,4- (OCH 2 O)C 6 H 3 CH 2-)生成双核环金属化产物,其中每个钯原子是C,N键合到去质子化的有机配体上,并键接到桥接两个金属中心的两个乙酸酯基团上。的治疗3,4- O(CH 2)2 ö}℃ 6 ħ 3 C(H)NCH 2 CH 2 NME 2与[PTME2(COD)]通过[C,N,N]原子给出了配体为三齿的单核化合物。通过1 H-NMR光谱和X射线衍射研究讨论了环金属化过程的区域选择性。
Biphenyl derivatives, process for preparing the same and intermediates
申请人:Tanabe Seiyaku Co., Ltd.
公开号:US05103023A1
公开(公告)日:1992-04-07
Novel biphenyl derivatives of the formula: wherein R.sup.1 is a substituted or unsubstituted aminocarbonyl group, aminothiocarbonyl group, a substituted or unsubstituted lower alkoxycarbonyl group, cyano group, or a group of the formula: ##STR1## one or two of R.sup.2 to R.sup.7 are hydrogen atom, and the remaining groups are the same or different and are each a lower alkoxy group, a phenyl(lower)alkoxy group or hydroxy group, or the adjacent two groups thereof combine to form a lower alkylenedioxy group, and Alk.sup.1 is a lower alkylene group, or a pharmaceutically acceptable salt thereof, which are useful for the prophylaxis and treatment of hepatic diseases, and processes for preparing the same, and intermediates therefor.
Total synthesis of cularine alkaloids via dibenzoxepines as key intermediates
作者:Alberto Garcia、Luis Castedo、Domingo Domínguez
DOI:10.1016/0040-4020(95)00473-l
日期:1995.7
The total synthesis of several cularine alkaloids (cularine, oxocularine, dioxocularine and 4-hydroxycularine) via 10,11-dihydrodibenz(b,f)oxepin-10-ones as key intermediates is reported.
Stereoselective Synthesis of 10-Isobornyl Sulfoxides
作者:Robert Kawęcki、Zofia Urbańczyk-Lipkowska
DOI:10.1055/s-1996-4258
日期:1996.5
Reaction of organometallic compounds with 10-isobornyl sulfinate 1 leads to 10-isobornyl sulfoxides with high stereoselectivity. This method has been used to prepare homochiral polydentate ligands containing the sulfinyl group.