Note of using static_cast

#include "stdafx.h"
#include <assert.h>

class IInterface1
{
public:
 virtual void VFunc1() = 0;
};

class IInterface2
{
public:
 virtual void VFunc2() = 0;
};

class TestClass1:
 public IInterface1, public IInterface2
{
 void VFunc1();
 void VFunc2();
};

void TestClass1::VFunc1()
{
 ;
}
void TestClass1::VFunc2()
{
 ;
}

class Interface12: 
 public IInterface1, public IInterface2
{

};
template<class Intttt>
Intttt* MakeInterface2(IInterface1* pInterface1)
{
 return static_cast<Intttt*>( static_cast<Interface12>(pInterface1) );
}

int _tmain(int argc, _TCHAR* argv[])
{
 TestClass1* pTestClass1 = new TestClass1();
 IInterface1* pInterface1 = dynamic_cast<IInterface1*>(pTestClass1);
 assert(pInterface1);
 IInterface2* pInterface2 = static_cast<IInterface2*>(pInterface1);
 IInterface2* pInterface2 = MakeInterface2<IInterface2>(pInterface1);
 return 0;
}

The red line code will cause compile error:
error C2440: 'static_cast' : cannot convert from 'IInterface1 *' to 'IInterface2 *'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast