Entry

Starting aldehyde

Iminophosphorane

Yield (%)^a

1

2-thiophenecarboxaldehyde

1

86

2

3-thiophenecarboxaldehyde

2

90

3

4-methyl-2-thiophenecarboxaldehyde

3

76

4

4-bromo-2-thiophenecarboxaldehyde

4

82

5

5-phenyl-2-thiophenecarboxaldehyde

5

85

6

4-phenyl-2-thiophenecarboxaldehyde

6

90

7

2-furanecarboxaldehyde

7

79

8

4-phenyl-2-furanecarboxaldehyde

8

81

9

N-methyl-2-pyrrolecarboxaldehyde

9

95

10

N-benzyl-2-pyrrolecarboxaldehyde

10

83

11

Phtalaldehyde

11

95