吗啉杂环是许多生物活性化合物和 FDA 批准的药物中发现的结构单元,但更复杂的 C 官能化吗啉衍生物的生成仍远未得到充分探索。利用系统化学多样性(SCD)这一概念,通过区域化学和立体化学变化指导饱和类药物支架的扩展,我们描述了从对映体纯氨基酸和氨基醇开始合成一系列甲基取代吗啉乙酸酯。总共产生了 24 种不同的取代吗啉,它们在区域化学和立体化学(相对和绝对)上系统地变化。这些不同的 C 取代吗啉可直接应用于片段筛选或作为药物化学和文库合成的构建模块。
Lewis Acid-Catalyzed Halonium Generation for Morpholine Synthesis and Claisen Rearrangement
作者:Jeewani P. Ariyarathna、Nur-E Alom、Leo P. Roberts、Navdeep Kaur、Fan Wu、Wei Li
DOI:10.1021/acs.joc.1c02804
日期:2022.3.4
We disclose here practical strategies toward the synthesis of morpholines and Claisenrearrangement products based on the divergent reactivity of a common halonium intermediate. These reactions employ widely available alkenes in a Lewis acid-catalyzed halo-etherification process that can then transform them into the desired products with exceptional regioselectivity for both activated and unactivated
A method may produce an isoquinoline-6-sulfonamide derivative useful as a medicinal drug; and an intermediate which is used for the method, and more specifically, a 1,4-diazocane compound of formula (8), wherein R
4
is an amino protecting group, or a salt thereof.
Synthesis of 6- and 7-Membered <i>N</i>-Heterocycles Using α-Phenylvinylsulfonium Salts
作者:Johnathan V. Matlock、Thomas D. Svejstrup、Pradip Songara、Sarah Overington、Eoghan M. McGarrigle、Varinder K. Aggarwal
DOI:10.1021/acs.orglett.5b02516
日期:2015.10.16
A concise synthesis of stereodefined C-substituted morpholines, piperazines, azepines, and oxazepines in moderate to excellent yields (27% to 75%) is reported by reaction of 1,2- or 1,3-amino alcohol/1,2- or 1,3-diamine with an alpha-phenylvinylsulfonium salt. High levels of regio- and diastereoselectivity (from 2:1 to >20:1) are observed through judicious choice of base (Cs2CO3) and solvent (CH2Cl2). Reactions are performed at ambient temperature and open to air and do not require anhydrous solvent. The deprotection of the N-sulfonamide protecting groups (N-Ts and N-Ns) is also demonstrated. Factors affecting regio- and diastereocontrol are discussed.