Cyclohexylisopropylamine → HCID 20461593, compound

HRID 1703042Notes

Reaction equation

HRID 1703042 reaction equation
[CH:1](NC1CCCCC1)(C)C.C([Li])CCC.[CH2:16]([CH:19]1[N:22]([C:23]([C:43]([O:45][CH2:46][C:47]2[CH:52]=[CH:51][CH:50]=[CH:49][CH:48]=2)=[O:44])=[P:24]([C:37]2[CH:42]=[CH:41][CH:40]=[CH:39][CH:38]=2)([C:31]2[CH:36]=[CH:35][CH:34]=[CH:33][CH:32]=2)[C:25]2[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=2)[C:21](=[O:53])[CH2:20]1)[CH:17]=[CH2:18]>O1CCCC1.CCCCCC>[CH2:16]([CH:19]1[N:22]([C:23]([C:43]([O:45][CH2:46][C:47]2[CH:52]=[CH:51][CH:50]=[CH:49][CH:48]=2)=[O:44])=[P:24]([C:25]2[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=2)([C:31]2[CH:36]=[CH:35][CH:34]=[CH:33][CH:32]=2)[C:37]2[CH:38]=[CH:39][CH:40]=[CH:41][CH:42]=2)[C:21](=[O:53])[CH:20]1[CH3:1])[CH:17]=[CH2:18]

Participants

6

Reactant 3

HCID 62386CyclohexylisopropylamineHCID 127969694-Allyl-1-(1-benzyloxycarbonyl-1-triphenylphosphoranylidenemethyl)azetidin-2-oneHCID 178418339Butyllithium

Product 1

HCID 20461593HCID 20461593, compound

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolvent2×HCID 8058HexaneSolvent

Procedure

A solution of N-isopropylcyclohexylamine (0.30 g) in dry tetrahydrofuran (5 ml) was stirred under argon and cooled to -78°. This was treated with a 2.5 M solution of n-butyl lithium in hexane (0.85 ml) and stirred for 10 minutes. A solution of 4-allyl-1-(1-benzyloxycarbonyl-1-triphenylphosphoranylidenemethyl)azetidine-2-one (9) (0.50 g) in tetrahydrofuran (5 ml) was added and after 5 minutes the anion was quenched by addition of methyl iodide (0.12 ml). After a period of 10 minutes the reaction vessel was transferred to an ice bath and a further 10 minutes later the reaction was neutralized by addition of acetic acid (0.16 ml). The solvent was then stripped off and the residue partitioned between ethyl acetate and brine. The ethyl acetate solution was separated, washed with brine and dried over sodium sulphate. The product was subjected to careful column chromatography on silica gel 60 eluting with cyclohexane/ethyl acetate mixtures grading from 1:1 to 3:7. This gave 4-allyl-3-methyl-1-(1-benzyloxycarbonyl-1-triphenylphosphoranylidenemethyl)azetidine-2-one (38) (0.10 g, 19%); νmax (CHCl3) 3000, 1735 and 1610 cm-1. Running closely behind this was recovered starting phosphorane (9) (0.17 g. 33%).

Workup

  1. temperaturecooled to -78°
  2. customwas quenched by addition of methyl iodide (0.12 ml)
  3. waitAfter a period of 10 minutes the reaction vessel was transferred to an ice bath and a further 10 minutes
  4. additionlater the reaction was neutralized by addition of acetic acid (0.16 ml)
  5. customthe residue partitioned between ethyl acetate and brine
  6. customThe ethyl acetate solution was separated
  7. washwashed with brine
  8. dry with materialdried over sodium sulphate
  9. customthis was recovered

Sources & evidence

ORD record
ord-f137394a74ae4af39f0dc56277d6e41c
Source dataset
uspto-grants-1982_09
Patent number
US04350703

Reaction notes

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