在本手稿中,我们报告了我们在哌啶存在下从 2-(甲酰基苯基)丙烯酸酯和苯甲酰肼中前所未有的立体选择性合成 2 H -isoindolin-1,3-ylidenes的观察结果。与我们之前的发现不同,我们在稍加修改的反应条件下从相同的起始材料中提取 3-酮基异喹啉,这种意想不到的一锅串联反应提供了一种有效且简单的方法来获取各种高度官能化的乙基 ( Z ) -2-(( Z )-3-(2-oxo-2-arylethylidene)-2,3-dihydro-1 H -benzo[ e ]isoindol-1-ylidene)-醋酸盐,产率非常好(高达91%)。本方法与多种官能团兼容。
已经报道了通过Cu I -Pybox-diPh催化的一锅式胺化-炔基化-氮杂-迈克尔序列对1,3-二取代的异吲哚啉和四氢异喹啉的对映体和非对映体选择性合成。三组分反应在一次操作中依次产生一个C–C和两个C–N键,且产率高(高达92%),对映选择性(高达99%)和非对映选择性(高达9:1)。此外,已经通过LiAlH 4的酯还原和炔烃官能度的氢化而不丧失立体选择性证明了该产品的合成效用。
Piperazine- and piperidine-derivatives as melanocortin receptor agonists
申请人:——
公开号:US20040082590A1
公开(公告)日:2004-04-29
The present invention relates to melanocortin receptor agonists of formula I, which is useful in the treatment of obesity, diabetes and male and/or female sexual dysfunction.
1
作者:Xi Liu、Zhonghao Wang、Qun Chen、Ming‐yang He、Liang Wang
DOI:10.1002/aoc.4039
日期:2018.2
A Rhodium(III)‐catalyzed ortho‐C‐H olefination of aromatic aldehydes in the presence of catalytic amount of TsNH2 has been developed. The in situ generated imine intermediate from aldehyde and TsNH2 worked as a transient directing group. Both electron‐rich and electron‐deficient aromatic aldehydes were tolerated, affording the corresponding products in moderate to good yields. Importantly, the present
NHC-Catalyzed Formal [4 + 2] Annulation of <i>o</i>-Formyl-Tethered Michael Acceptors and Ynones to Access Highly Functionalized Naphthalene Derivatives
Herein we demonstrate a novel organocatalytic method to access multifunctionalized naphthalenes via an NHC-catalyzed reaction of ynones and o-formyl-tethered Michael acceptors. The presented method proceeds through an intermolecular Stetter reaction–cyclization–aromatization cascade and represents a rare example of organocatalytic benzannulation for the synthesis of substituted arenes by using ynone