Method of producing an o-disubstituted aromatic compound, and method of producing a monosubstituted-monohaloaromatic compound
申请人:Yoshida Jun-ichi
公开号:US20080194816A1
公开(公告)日:2008-08-14
A method of producing an o-disubstituted aromatic compound, containing: continuously conducting at least the following steps (a) to (d):
(a) a step of mono-lithiating one halogen atom of an o-dihaloaromatic compound, using a first microreactor;
(b) a step of making the thus-obtained monolithiated product to react with an electrophilic compound, using a second microreactor, to obtain a monosubstituted-monohaloaromatic compound;
(c) a step of lithiating the other halogen atom of the o-dihaloaromatic compound, using a third microreactor; and
(d) a step of making the thus-obtained lithiated product successively to react with an electrophilic compound, using a forth microreactor.
Generation and Reactions of <i>o</i>-Bromophenyllithium without Benzyne Formation Using a Microreactor
作者:Hirotsugu Usutani、Yutaka Tomida、Aiichiro Nagaki、Hideho Okamoto、Toshiki Nokami、Jun-ichi Yoshida
DOI:10.1021/ja068330s
日期:2007.3.1
Microflow systems were found to serve as powerful tools for mechanistic studies on reactions involving highly unstable intermediates such as o-bromophenyllithium, which is known to decompose to benzyne very quickly even at -78 degrees C. Precise residence time control and precise temperature control of microsystems are responsible. Based on the information thus obtained, the Br-Li exchange reaction of o-dibromobenzene followed by reactions with electrophiles without benzyne formation was achieved using a microflow system. Sequential use of two bromine atoms in o-dibromobenzene with Br-Li exchange reactions followed by the reactions with electrophiles using the microsystem consisting of four micromixers and four microtube reactors was also accomplished.
Jaura, K. L.; Churamani, L. K.; Sharma, K. K., Indian journal of chemistry, 1966, vol. 4, p. 329 - 330
作者:Jaura, K. L.、Churamani, L. K.、Sharma, K. K.
DOI:——
日期:——
Simple preparation of aryltributylstannanes and its application to one-pot synthesis of diaryl ketones
aryl group from boron to tin can be achieved by simple treatment of arylboronic acids with tributyltin methoxide at 100 °C for 1 h under neat conditions. The resulting aryltributylstannanes are applicable to one-pot synthesis of diaryl ketones. Thus, Pd-catalyzed cross-coupling reaction with aroyl chlorides is allowed to proceed without isolation step to produce the corresponding diaryl ketones in