本报告描述了一种高效洁净代次磺酸的盐(R 1 SO - )通过热解容易获得的叔丁基亚砜,得到次磺酸(R 1 SOH)和无痕迹的异丁烯,随后夺氢用弱无机碱( K 3 PO 4)。该过程的相关性通过与芳基卤化物/三氟甲磺酸酯生成芳基亚砜的原位钯催化交叉偶联反应得到了例证。开发的操作简单的CS键形成协议使用Pd(dba)2作为催化剂,Xantphos作为甲苯或甲苯/ H 2中的配体O混合物。进一步的扩展包括使用二叔丁基亚砜作为一氧化硫二价阴离子(SO 2−)的等同物,并开发了[2.2]对环环烷和联芳基系列的非对映选择性形式。
本报告描述了一种高效洁净代次磺酸的盐(R 1 SO - )通过热解容易获得的叔丁基亚砜,得到次磺酸(R 1 SOH)和无痕迹的异丁烯,随后夺氢用弱无机碱( K 3 PO 4)。该过程的相关性通过与芳基卤化物/三氟甲磺酸酯生成芳基亚砜的原位钯催化交叉偶联反应得到了例证。开发的操作简单的CS键形成协议使用Pd(dba)2作为催化剂,Xantphos作为甲苯或甲苯/ H 2中的配体O混合物。进一步的扩展包括使用二叔丁基亚砜作为一氧化硫二价阴离子(SO 2−)的等同物,并开发了[2.2]对环环烷和联芳基系列的非对映选择性形式。
The tert-BUTYL sulfoxide directed ortho metalation group. New synthetic methodology for substituted aromatics and pyridines and comparisons with others metalation directors
Details of the directedorthometalation of tert-butyl phenyl sulfoxide (1 and 2-and 4-tert-butyl pyridyl sulfoxides (3a,b are described along with comparisons with established metalationdirectors (CONR2, OCONR2, OMOM, SO2t-Bu) via inter-and intramolecular competition experiments.
Diastereoconvergent Synthesis of <i>trans</i>-5-Hydroxy-6-Substituted-2-Piperidinones by Addition–Cyclization–Deprotection Process
作者:Chang-Mei Si、Wei Huang、Zhen-Ting Du、Bang-Guo Wei、Guo-Qiang Lin
DOI:10.1021/ol5020812
日期:2014.8.15
A diastereoselective one-pot approach to access trans-5-hydroxy-6-substituted-2-piperidinones by an addition-cyclization-deprotection process has been developed, in which the stereogenic center at the C-6 position was solely controlled by alpha-OTBS group. The utility of this transformation is demonstrated by the asymmetric synthesis of the enantiomer of (-)-CP-99,994.
<i>tert</i>-Butyl Sulfoxides: Key Precursors for Palladium-Catalyzed Arylation of Sulfenate Salts
clean generation of sulfenatesalts (R1SO−) by pyrolysis of readily available tert‐butyl sulfoxides to give sulfenic acids (R1SOH) and traceless isobutene, followed by hydrogen abstraction with a weak inorganic base (K3PO4). The relevance of this process was exemplified through an in situ palladium‐catalyzed cross‐coupling reaction with aryl halides/triflates leading to aryl sulfoxides. The operationally
本报告描述了一种高效洁净代次磺酸的盐(R 1 SO - )通过热解容易获得的叔丁基亚砜,得到次磺酸(R 1 SOH)和无痕迹的异丁烯,随后夺氢用弱无机碱( K 3 PO 4)。该过程的相关性通过与芳基卤化物/三氟甲磺酸酯生成芳基亚砜的原位钯催化交叉偶联反应得到了例证。开发的操作简单的CS键形成协议使用Pd(dba)2作为催化剂,Xantphos作为甲苯或甲苯/ H 2中的配体O混合物。进一步的扩展包括使用二叔丁基亚砜作为一氧化硫二价阴离子(SO 2−)的等同物,并开发了[2.2]对环环烷和联芳基系列的非对映选择性形式。