An interesting procedure for thioester synthesis via nickel-catalyzed thiocarbonylation of arylboronic acid with sulfonyl chlorides as the sulfur source has been explored. Using Mo(CO)6 as a solid CO surrogate and reductant, a broad range of thioesters were obtained in moderate to good yields with good functional group tolerance.
The reaction between arenediazonium tetrafluoroborates and alkaline thiocarboxylates in DMSO: A convenient access to aryl thiolesters and other aromatic sulfur derivatives.
thiobenzoate and arenediazonium tetrafluoroborates in DMSO leads to the corresponding aryl thiolesters 1 which can either be isolated or further reacted providing a convenient one-pot access to a number of other aromatic sulfur derivatives.
Efficient copper-catalyzed coupling of aryl iodides and thiobenzoic acid
作者:Naotaka Sawada、Takahiro Itoh、Nobuyoshi Yasuda
DOI:10.1016/j.tetlet.2006.07.008
日期:2006.9
A highly efficient copper-catalyzedcoupling reaction of aryliodides and thiobenzoic acid, using 10 mol % of copper iodide, 20 mol % of 1,10-phenanthroline, and iPr2NEt in toluene, was developed. This methodology is applicable to a variety of aryliodides.
Taboury, Annales de Chimie (Cachan, France), 1908, vol. <8>15, p. 18,36,41
作者:Taboury
DOI:——
日期:——
Epidural naloxone reduces intestinal hypomotility but not analgesia of epidural morphine
作者:Jaemin Lee、Jae Y. Shim、Jeong H. Choi、Eun S. Kim、Ou K. Kwon、Dong E. Moon、Jong H. Choi、Michael J. Bishop
DOI:10.1007/bf03019815
日期:2001.1
Purpose: Epidural morphine is associated with decreased bowel motility and increased transit time, Low doses of intravenous naloxone reduce morphine-induced pruritus without reversing analgesia, but the effect of epidural naloxone on bowel motility has not been studied. Therefore we evaluated bowel motility and analgesia when naloxone was co-administered with morphine into the epidural space.Methods: Forty-three patients having combined thoracic epidural and general anesthesia for subtotal gastrectomy were randomly assigned to one of two study groups. All received a bolus dose of 3 mg epidural morphine at the beginning of surgery, followed by a continuous epidural infusion containing 3 mg morphine in 100 mi bupivacaine 0.125% with either no naloxone (control group, n = 18) or a calculated dose of 0.208 mug.kg(-1).hr(-1) of naloxone (experimental group, n = 25) for 48 hr. We measured the time to the first postoperative passage of flatus and feces to evaluate the restoration of bowel function, and visual analog scales (VAS) for pain during rest and movement. Scores were assessed at 2, 4, 8, 16, 24, 36 and 48 hr postoperatively.Results: The experimental group had a shorter time to the first postoperative passage of flatus (51.9 +/- 16.6 hr vs 87.0 +/- 19.5 hr, P < 0.001) and feces (95.3 +/- 25.0 hr vs 132.9 +/- 29.4 hr, P < 0.001). No differences were found in either resting or active VAS between the two groups.Conclusion: Epidural naloxone reduces epidural morphine-induced intestinal hypomotility without reversing its analgesic effects.