用浓溶液处理2-(1-羟烷基)丙-2-烯酸甲酯1。用HBr溶液得到(Z)-2-(溴甲基)烷-2-烯酸甲酯2,将其区域选择性地转化成N-取代的甲基(E)-2-(氨甲基)烷-2-烯酸酯3(S N 2反应)并进入ñ取代的甲基2-(1-氨基烷基)丙-2- enoates 4(S ñ 2'反应)。胺对亲核性攻击的区域控制仅通过选择溶剂即可完成,S N 2反应发生在MeCN和S N中。在石油醚中进行2'反应。水解和内酰胺化分别得到β-内酰胺7和8,分别在C(3)处含有外环亚烷基和亚甲基。
用浓溶液处理2-(1-羟烷基)丙-2-烯酸甲酯1。用HBr溶液得到(Z)-2-(溴甲基)烷-2-烯酸甲酯2,将其区域选择性地转化成N-取代的甲基(E)-2-(氨甲基)烷-2-烯酸酯3(S N 2反应)并进入ñ取代的甲基2-(1-氨基烷基)丙-2- enoates 4(S ñ 2'反应)。胺对亲核性攻击的区域控制仅通过选择溶剂即可完成,S N 2反应发生在MeCN和S N中。在石油醚中进行2'反应。水解和内酰胺化分别得到β-内酰胺7和8,分别在C(3)处含有外环亚烷基和亚甲基。
Palladium(0)-Catalyzed Regioselective Synthesis of α-Dehydro-β-amino Esters from Amines and Allyl Acetates: Synthesis of a α-Dehydro-β-amino Acid Derived Cyclic Peptide as a Constrained β-Turn Mimic
作者:S. Rajesh、Biswadip Banerji、Javed Iqbal
DOI:10.1021/jo010981d
日期:2002.11.1
Acetates derived from the adducts of the Baylis-Hillman reaction can be reacted in a regioselective manner with amines in the presence of palladium(0) catalyst to afford alpha-dehydro-beta-amino esters (2 and 3) in good yields. The regioselectivity of the reaction can be controlled by temperature and reaction medium leading to the synthesis of regioisomers 2 or 3. The alpha-dehydro-beta-amino acid
Synthesis of β-Amino Esters by Regioselective Amination of Allyl Bromides with Aryl and Alkyl Amines
作者:Chun-Cheng Lin、Adam Shih-Yuan Lee、Hung-Yang Chen、Laxmikant N. Patkar、Shau-Hua Ueng
DOI:10.1055/s-2005-871934
日期:——
One of the two possible regioisomers can be exclusively formed by combining a suitable solvent and a specific amount of triethylamine as a base during the amination of allyl bromide 5. The SN2′ product 7 was produced using dichloromethane as a solvent and triethylamine (7 equiv) as base; SN2 product 6 was predominantly generated in hexane with 0.5 equivalents of triethylamine. Furthermore, a new reaction condition for the efficient cyclization of 7 to yield α-methylene β-lactam 8 using Sn[N(TMS)2]2 as a reagent, is disclosed.
Cerium(IV) ammonium nitrate catalyzed synthesis of α-dehydro-β-amino esters
作者:Moumita Paira、Samir Kumar Mandal、Subhas Chandra Roy
DOI:10.1016/j.tetlet.2008.02.054
日期:2008.4
α-Dehydro-β-amino esters have been synthesized regioselectively from acetates of Baylis–Hillman adducts with amines in the presence of a catalytic amount of ceric ammoniumnitrate (CAN) in good yield. The regioselectivity does not differ with respect to the polarity of the solvent.
Oxidative Heck Coupling of Allylic Amines with 2,2,6,6‐Tetramethylpiperidine‐
<i>N</i>
‐oxyl (TEMPO) as Oxidant for the Preparation of Tetrasubstituted Alkenes
作者:Zhiheng He、Birgit Wibbeling、Armido Studer
DOI:10.1002/adsc.201300846
日期:2013.12.16
AbstractThe paper describes the oxidative Heck arylation of various allylic amines using arylboronic acids for the preparation of tetrasubstituted alkenes. As oxidant the commercially available 2,2,6,6‐tetramethylpiperidine‐N‐oxyl (TEMPO) is used and coupling reactions occur under very mild conditions at room temperature. The densely substituted alkenes are formed in good to excellent yields with complete control of the diastereoselectivity. Substrate scope with respect to the allylic amine and the arylboronic acid is investigated.magnified image
Rajesh; Srivastava; Banerji, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2001, vol. 40, # 11, p. 1029 - 1032