Thionyl Chloride-Benzotriazole in Methylene Chloride: A Convenient Solution for Conversion of Alcohols and Carboxylic Acids Expeditiously into Alkyl Chlorides and Acid Chlorides by Simple Titration
Synthesis of Highly Substituted Tetrahydrofurans by Catalytic Polar-Radical-Crossover Cycloadditions of Alkenes and Alkenols
作者:Jean-Marc M. Grandjean、David A. Nicewicz
DOI:10.1002/anie.201210111
日期:2013.4.2
Light up my ring: The title reaction is catalyzed by an acridinium/phenylmalononitrile photoredox system. A variety of readily available olefins and unsaturated alcohols can be employed to furnish tetrahydrofuran adducts with complete regiocontrol and up to four contiguous stereogenic centers.
Application of a Chiral Scaffolding Ligand in Catalytic Enantioselective Hydroformylation
作者:Amanda D. Worthy、Candice L. Joe、Thomas E. Lightburn、Kian L. Tan
DOI:10.1021/ja107433h
日期:2010.10.27
The synthesis of β-amino-aldehydes has been achieved throughenantioselective hydroformylation of PMP-protected allylic amines. The reaction is accomplished by using a scalemic scaffolding ligand that covalently and reversibly binds to the substrate. These ligands behave like chiral auxiliaries because they are covalently attached to the substrate during hydroformylation; however, similar to traditional
β-氨基醛的合成是通过 PMP 保护的烯丙胺的对映选择性加氢甲酰化来实现的。该反应是通过使用与底物共价可逆结合的鳞片支架配体来完成的。这些配体的行为类似于手性助剂,因为它们在加氢甲酰化过程中共价连接到底物上;然而,与传统的不对称配体类似,它们可以以催化量使用。二取代烯烃的直接加氢甲酰化在温和条件(35 °C 和 50 psi CO/H(2))下进行,Z-烯烃具有优异的对映选择性(高达 93% ee)。
Methods of producing aminobutene derivatives
申请人:Fujirebio Inc.
公开号:US05616711A1
公开(公告)日:1997-04-01
A method of producing an aminobutene derivative of formula (I) by allowing a butenol derivative of formula (II) to react with an amide derivative of formula (III) is disclosed. The aminobutene derivative of formula (I) can be deprotected to produce an aminobutene derivative of formula (I-1) or an aminobutene derivative of formula (I-2): ##STR1## The aminobutene derivative of formula (I-A) can also be deprotected to produce the aminobutene derivative of formula (I-B). Any or all of the above aminobutene derivatives are useful as intermediates for producing anti-ulcer drugs, and anti-ulcer drugs having an inhibitory effect on gastric acid secretion based on the antagonism against histamine H.sub.2 receptor.
Regioselective Hydroformylation of Allylic Alcohols
作者:Thomas E. Lightburn、Omar A. De Paolis、Ka H. Cheng、Kian L. Tan
DOI:10.1021/ol200782d
日期:2011.5.20
hydroformylation of allylicalcohols is reported toward the synthesis of β-hydroxy-acid and aldehyde products. The selectivity is achieved through the use of a ligand that reversibly binds to alcohols in situ, allowing for a directed hydroformylation to occur. The application to trisubstituted olefins was also demonstrated, which yields a single diastereomer product consistent with a stereospecific addition of CO
据报道,烯丙醇的高度区域选择性加氢甲酰化可用于合成 β-羟基酸和醛产物。选择性是通过使用一种配体来实现的,该配体在原位可逆地结合醇,允许发生定向加氢甲酰化。还证明了三取代烯烃的应用,这产生了与 CO 和氢的立体有择加成一致的单一非对映异构体产品。
Regioselective Hydroformylation of Sulfonamides using a Scaffolding Ligand
作者:Amanda D. Worthy、Moriah M. Gagnon、Michael T. Dombrowski、Kian L. Tan
DOI:10.1021/ol900921e
日期:2009.7.2
A highly regioselective hydroformylation of allylic sulfonamides has been developed by employing a catalyticdirectinggroup. The reaction tolerates a wide range of electronically and sterically modified olefins, and only 10% of the scaffolding ligand is required to effectively control the regioselectivity.