Synthesis of 2‐Substituted Cyclobutanones by a Suzuki Reaction and Dephosphorylation Sequence
作者:Jakub Koudelka、Tomáš Tobrman
DOI:10.1002/ejoc.202100464
日期:2021.6.14
A methodology for the preparation of 2-substituted cyclobutanones from 2-substituted cyclobutenyl diethyl phosphates is described. Substrates containing electron-donating groups prefer the formation of 2-substituted cyclobutanones, while electron-withdrawing groups facilitate the opening of the cyclobutanone ring. The synthesis of cyclobutenyl sulfides is an additional advantage of this method.
A synthesis of esters, amides, and sulfones bearing a 1-cyclopentenyl group at the α-position from cyclobutanones with one-carbon ring-expansion
作者:Tsuyoshi Satoh、Yu Awata、Shingo Ogata、Shimpei Sugiyama、Masami Tanaka、Motoo Tori
DOI:10.1016/j.tetlet.2009.02.053
日期:2009.4
derived from cyclobutanones and chloromethyl p-tolyl sulfoxide, with lithium enolate of carboxylic acid tert-butyl esters, lithium enolate of carboxylic acid N,N-dimethylamides, or lithium α-carbanion of alkyl phenyl sulfones gave adducts in high yields. The adducts were treated with isopropylmagnesium chloride or ethylmagnesium chloride in dry toluene to give esters, amides, and sulfones bearing a 1-cyclopentenyl
2,2-Dimethyl cyclopentanones by acid catalyzed ring expansion of isopropenylcyclobutanols. A short synthesis of (±)-α-cuparenone and (±)-herbertene
作者:Angela M. Bernard、Angelo Frongia、Francesco Secci、Pier P. Piras
DOI:10.1039/b505707h
日期:——
catalyzed ring expansion of isopropenylcyclobutanols; the method allows ready access to the family of sesquiterpenes cuparanes and herbertanes, as demonstrated by the synthesis of (+/-)-alpha-cuparenone and the direct precursor of (+/-)-herbertene.
Semipinacol Rearrangement of Cyclopropenylcarbinols for the Synthesis of Highly Substituted Cyclopropanes
作者:Vladyslav Smyrnov、Jerome Waser
DOI:10.1021/acs.orglett.3c02543
日期:2023.9.29
cyclopropenylcarbinols is reported. This transformation gives access to various polyfunctionalized cyclopropanes under mild metal-free conditions. The scope of the reaction includes iodine, sulfur and selenium electrophiles, aryl and strained ring migrating groups, and diverse substitution patterns on the cyclopropene. The reaction is particularly efficient for the synthesis of small ring-containing spirocycles, which
Ring‐Opening Amino Esterification of Cyclic Ketones to Access Distal Amino Acid Derivatives
作者:Ishin Tomiya、Yuhao Wu、Kengo Hyodo
DOI:10.1002/adsc.202301421
日期:2024.4.9
synthesizing distal aminoacidderivatives by the ring-opening reaction of cyclic ketones, following the amino esterification functionalization of both terminals. To achieve this goal, we performed the ring-opening reaction of cyclic ketones with an aminating reagent and alcohol under metal- and photocatalysis-free conditions in a single step. The method directly afforded distal aminoacidderivatives bearing