AbstractAn iron(III)‐Schiff base‐catalyzed, highly enantioselective hydrophosphonylation of various aldehydes is described. Under the optimized reaction conditions, 5 mol% of the iron/camphor‐based tridentate Schiff base complex [FeCl(SBAIB‐d)]2 produces high yields (up to 99%) of α‐hydroxy phosphonates in excellent enantioselectivities (up to 99%). The merits of this catalytic system are an easily synthesizable catalyst, inexpensive starting materials, practically simple aerobic reaction conditions, and low catalyst loading (5 mol%).magnified image
The phosphonate-phosphate and phosphate-phosphonate rearrangement and their applications V. On the reaction ofs-butyllithium/TMEDA with symmetrical trialkyl phosphates
摘要:
1-(Tributylstannyl)hexanol ((+/-)-8) is phosphorylated to give phosphate (+/-)-9 which is then transmetallated. The organolithium intermediate (+/-)-10 isomerizes to alpha-hydroxyphosphonate (+/-)-12. Similar intermediates are also formed upon direct deprotonation of triethyl, tri-n-propyl, and tri-n-butyl phosphate, which subsequently rearrange to alpha-hydroxyphosphonates (+/-)-14a-c.